Mecograph Serial Number List
The table of Mecograph serial numbers below shows the serial number, model, latest patent date stamped on the key, whether or not the key has the number "3" cast into the underside of the base, and whether the serial number is stamped along the edge of the key base or underneath the base.
| Serial Number | Model | Latest Patent Date | "3" On Bottom ? | S/N: Edge or Bottom |
| None | First Model | Patents Pending | ||
| None | First Model | Patents Pending | ||
| None | First Model | Patents Pending | ||
| 265 | Combo Model | Patents Pending | Edge | |
| 518 | Unknown Right Angle Key | Edge | ||
| 550 | Unknown Right Angle Key | Edge | ||
| 1057 | Combo Model | Edge | ||
| 1136 | Combo Model | Edge | ||
| 2005 | Square Weight Model 3 - Brass Base | Patents Pending | YES | Edge |
| 2032 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2046 | Square Weight Model 3 | YES | Edge | |
| 2054 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2064 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2079 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2097 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2158 | Square Weight Model 3 | YES | Edge | |
| 2170 | Square Weight Model 3 | YES | Edge | |
| 2211 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2280 | Square Weight Model 3 | YES | Edge | |
| 2304 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2329 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2332 | Square Weight Model 3 | YES | Edge | |
| 2262 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2365 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2403 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2433 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2435 | Square Weight Model 3 | YES | Edge | |
| 2538 | Square Weight Model 3 | Feb. 13, 1906 | YES | Edge |
| 2546 | Square Weight Model 3 | YES | Edge | |
| 2608 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 2656 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 2780 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 2818 | Square Weight Model 3 | YES | Edge | |
| 2825 | Square Weight Model 3 | None | YES | Edge |
| 2841 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 2880 | Square Weight Model 3 | Patents Pending | YES | Edge |
| 2889 | Square Weight Model 3 | NO | Edge | |
| 2932 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3079 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3089 | Square Weight Model 3 | NO | Edge | |
| 3112 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3161 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3166 | Square Weight Model 3 | |||
| 3203 | Square Weight Model 3 | NO | Edge | |
| 3242 | Square Weight Model 3 | NO | Edge | |
| 3367 | Square Weight Model 3 | NO | Edge | |
| 3380 | Square Weight Model 3 | NO | Edge | |
| 3387 | Square Weight Model 3 | NO | Edge | |
| 3415 | Square Weight Model 3 | NO | Edge | |
| 3469 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3470 | Square Weight Model 3 | NO | Edge | |
| 3474 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3489 | Square Weight Model 3 | Patents Pending | NO | Edge |
| 3510 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3517 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3544 | Model 4 | NO | Edge | |
| 3611 | Model 4 | NO | Edge | |
| 3613 | Model 4 | NO | Edge | |
| 3653 | Square Weight Model 3 | NO | Edge | |
| 3691 | Model 4 | NO | Edge | |
| 3711 | Model 4 | NO | Edge | |
| 3719 | Model 4 | NO | Edge | |
| 3745 | Square Weight Model 3 | NO | Edge | |
| 3810 | Square Weight Model 3 | NO | Edge | |
| 3843 | Square Weight Model 3 | NO | Edge | |
| 3871 | Square Weight Model 3 | Feb. 13, 1906 | NO | Edge |
| 3883 | Model 4 | No Patent Dates | NO | Edge |
| 3900 | Model 4 | NO | Edge | |
| 4082 | Round Weight Model 3 | No Patent Dates | NO | Edge |
| 4191 | Model 5 | NO | Edge | |
| 4318 | Round Weight Model 3 | NO | Edge | |
| 4352 | Round Weight Model 3 | May. 28, 1907 | NO | Edge |
| 4399L | LEFT HANDED Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 4472 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 4531 | Round Weight Model 3 | NO | Edge | |
| 4598 | Round Weight Model 3 | NO | Edge | |
| 4617 | Round Weight Model 3 | NO | Edge | |
| 4669 | Round Weight Model 3 | NO | Edge | |
| 4723 | Round Weight Model 3 | NO | Edge | |
| 4669 | Round Weight Model 3 | NO | Edge | |
| 4692 | Round Weight Model 3 | NO | Edge | |
| 4882 | Round Weight Model 3 | NO | Edge | |
| 4813 | Round Weight Model 3 | NO | Edge | |
| 4921 | Round Weight Model 3 | May 5, 1908 | NO | Edge |
| 4943 | Round Weight Model 3 | NO | Edge | |
| 4971 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 4996 | Round Weight Model 3 | NO | Edge | |
| 4999 | Round Weight Model 3 | NO | Edge | |
| 5069 | Round Weight Model 3 | NO | Edge | |
| 5133 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5260 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5345 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5367 | Round Weight Model 3 | NO | Edge | |
| 5378 | Round Weight Model 3 | May. 5, 1908 | NO | |
| 5387 | Round Weight Model 3 | NO | Edge | |
| 5391 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5421 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5423 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5462 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5495 | Round Weight Model 3 | NO | Edge | |
| 5514 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5537 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5593 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5596 | Round Weight Model 3 | NO | Edge | |
| 5661 | Round Weight Model 3 | NO | Edge | |
| 5668 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 5787 | Round Weight Model 3 | NO | Edge | |
| 5853 | Round Weight Model 3 | May. 5, 1908 | NO | |
| 5867 | Round Weight Model 3 | NO | Edge | |
| 5911 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 6006 | Round Weight Model 3 | NO | Edge | |
| 6051 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 6098 | Round Weight Model 3 | NO | Edge | |
| 6100 | Round Weight Model 3 | |||
| 6144 | Round Weight Model 3 | May 5, 1908 | NO | Edge |
| 6162 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 6164 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 6167 | Round Weight Model 3 | May. 5, 1908 | NO | Edge |
| 6324 | Round Weight Model 3 | NO | Edge | |
| 6369 | Round Weight Model 3 | NO | Edge | |
| 6374 | Round Weight Model 3 | NO | Edge | |
| 6475 | Round Weight Model 3 | ? | ? | |
| 6492 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 6494 | Round Weight Model 3 | YES | Edge | |
| 6523 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 6598 | Round Weight Model 3 | YES | Edge | |
| 6623 | Round Weight Model 3 | YES | Edge | |
| 6766 | Round Weight Model 3 | YES | Edge | |
| 6814 | Round Weight Model 3 | No Patent Dates | YES | Edge |
| 6816 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 6829 | Round Weight Model 3 | YES | Edge | |
| 6830 | Round Weight Model 3 | YES | Edge | |
| 7102 | Round Weight Model 3 | YES | Edge | |
| 7132 | Round Weight Model 3 | YES | Edge | |
| 7272 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 7301 | Round Weight Model 3 | None | YES | Edge |
| 7306 | Round Weight Model 3 | YES | Edge | |
| 7374 | Round Weight Model 3 | YES | Edge | |
| 7446 | Round Weight Model 3 | YES | Edge | |
| 7464 | Round Weight Model 3 | YES | Edge | |
| 7500 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 7589 | Round Weight Model 3 | YES | Edge | |
| 7614 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 7618 | Round Weight Model 3 | Nov. 9, 1909 | YES | Edge |
| 7656 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 7666 | Round Weight Model 3 | Edge | ||
| 7818 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 7992 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 8060 | Round Weight Model 3 | May. 5, 1908 | YES | Bottom |
| 8107 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 8142 | Round Weight Model 3 | YES | Bottom | |
| 8356 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 8410 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 8627 | Round Weight Model 3 | YES | Bottom | |
| 8760 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 8765 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 9005 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 9006 | Round Weight Model 3 | YES | Bottom | |
| 9025 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 9050 | Round Weight Model 3 | YES | Bottom | |
| 9055 | Round Weight Model 3 | YES | Bottom | |
| 9174 | Round Weight Model 3 | YES | Bottom | |
| 9264 | Round Weight Model 3 | No Patent Dates | YES | Bottom |
| 9354 | Round Weight Model 3 | YES | Bottom | |
| 9378 | Round Weight Model 3 | Nov. 9, 1909 | YES | Bottom |
| 9440 | Round Weight Model 3 | Bottom | ||
| 9505 | Round Weight Model 3 | Bottom | ||
| 10008 | Premier | Nov. 9, 1909 | Bottom | |
| 10138 | Premier | Bottom | ||
| 10144 | Premier | Bottom | ||
| 10200 | Premier | Bottom | ||
| 10204 | Premier | Bottom | ||
| 10426 | Premier | Bottom | ||
| 10449 | Premier | Bottom | ||
| 10455 | Premier | Bottom | ||
| 10461 | Premier | Bottom | ||
| 10494 | Premier | May 28, 1907 | Bottom | |
| 10504 | Premier | Bottom | ||
| 10523 | Premier | Bottom | ||
| 10552 | Premier | Bottom | ||
| 10601 | Premier | Bottom | ||
| 10607 | Premier | Bottom | ||
| 10618 | Premier | Bottom | ||
| 10636 | Premier | Bottom | ||
| 10644 | Premier | Bottom | ||
| 10684 | Premier | Bottom | ||
| 10690 | Premier | Bottom | ||
| 10694 | Premier | Bottom | ||
| 10696 | Premier | Bottom | ||
| 10803 | Premier | Bottom | ||
| 10829 | Premier | Bottom | ||
| 10863 | Premier | Bottom | ||
| 10888 | Premier | Bottom | ||
| 11069 | Premier | Bottom | ||
| 11161 | Premier | Bottom | ||
| 11240 | Premier | Bottom | ||
| 11307 | Premier | Bottom | ||
| 11323 | Premier | Bottom | ||
| 11361 | Premier | Bottom | ||
| 11390 | Premier | Bottom | ||
| 11445 | Premier | Bottom | ||
| 11547 | Premier | Bottom | ||
| 12005 | Premier- Steel Base | Nov. 9, 1909 | Bottom | |
| 12041 | Premier | Bottom | ||
| 12072 | Premier | Bottom | ||
| 12083 | Premier | Bottom | ||
| 12169 | Premier | Bottom | ||
| 14005 | Solid Base Model 3 | Nov. 9, 1909 | Bottom | |
| 14021 | Solid Base Model 3 | Nov. 9, 1909 | Bottom | |
| 14036 | Solid Base Model 3 | Bottom | ||
| 14219 | Solid Base Model 3 | Nov. 9, 1909 | Bottom | |
| C564 | Vibroplex Premier | Nov. 9, 1909 | ||