This serial number data is from the Serial Number Reference Book for Metalworking Machinery (1959 edition).
Gear Hobbing Machines
| Machine Description | 1920 | 1921 | 1922 | 1923 | 1924 | 1925 | 1926 | 1927 | 1928 | 1929 | 1930 | 1931 | 1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | 1942 | 1943 | 1944 | 1945 | 1946 | 1947 | 1948 | 1949 | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 |
| #1½ | | | | | | | | | | | | | | | | | | 1-2 | 3-25 | 26-40 | 41-61 | 62-243 | 244-453 | 454-503 | 504-525 | 526-559 | 560-591 | 592-615 | 616-638 | 639-646 | 647-669 | 670-695 | 696-736 | 737-773 | 774-815 | 816-850 | 851-878 | 879-904 |
| 4-4 | 6-18 | 19-38 | 39-54 | 55-77 | 78-92 | 93-116 | 117-141 | 142-163 | 164-202 | 203-251 | 252-263 | 264-277 | 278-281 | 282-289 | 290-298 | 299-353 | 354-394 | 395-441 | 442-456 | 457-467 | 468-502 | 503-574 | 575-660 | 661-776 | 777-825 | 826-859 | 860-875 | 876-890 | 891-900 | 901-917 | 918-939 | 940-963 | 964-1021 | 1063 | 1089 | 1104 | 1127 | 1135 |
| 6-5 | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | 2 | 3-10 | 11-32 | | 33 | 34-46 | 68 | 111 | 130 | 179 | 202 |
| #6-10 | 389-555 | 556-579 | 580-617 | 618-706 | 707-733 | 734-788 | 789-832 | 833-865 | 866-954 | 955-1039 | 1040-1083 | 1084-1109 | 1110-1121 | 1122-1128 | 1129-1154 | 1155-1194 | 1195-1271 | 1272-1361 | 1362-1413 | 1414-1492 | 1493-1656 | 1657-2004 | 2005-2491 | 2492-2941 | 2942-3076 | 3077-3207 | 3208-3329 | 3330-3446 | 3447-3505 | 3506-3555 | 3556-3624 | 3625-3764 | 3765-3943 | 3944-4181 | 4182-4353 | 4354-4460 | 4461-4559 | 4560-4669 |
| 8-10 | | | | | | | | | | | | | | | | | | | | 1-2 | 3-19 | 20-35 | 36-55 | | | 56-66 | 67-75 | 76-82 | 83-107 | 108-112 | 113-126 | 127-133 | | 139 | | 151 | | |
| 10-12 | | | | | | | | 1-2 | 3 | | | 4 | | | | 5-10 | 11-16 | 17-21 | 22-27 | 28-39 | 40-51 | 52-78 | 79-134 | 135-204 | 205-230 | 231-259 | 260-269 | 270-281 | 282-289 | 290-306 | 307-323 | 324-344 | 345-393 | 411 | 465 | 483 | 498 | 523 |
| 12HM | 1638-2003 | 2004-2023 | 2024-2087 | 2088-2291 | 2292-2375 | 2376-2524 | 2525-2731 | 2732-2865 | 2866-3101 | 3102-3313 | 3314-3414 | 3415-3486 | 3487-3497 | 3498-3509 | 3510-3543 | 3544-3583 | 3584-3632 | 3633-3683 | 3684-3688 | 3689-3701 | 3702-3719 | | | | | | | | | | | | | | | | | |
| 14-15 | | | | | | | | | | | | | | | | | 1 | 2-13 | 14-21 | 22-37 | 38-61 | 62-85 | 86-150 | 151-237 | 238-319 | 320-372 | 373-397 | 398-432 | 433-470 | 471-483 | 484-504 | 505-556 | 557-622 | 633 | 708 | 748 | 795 | 816 |
| 16-11 | | | | | | | | | | | | | | | 1-7 | 8-12 | 13-15 | 16-21 | 22-26 | 27-31 | 32-46 | 47-68 | 69-100 | 101-117 | 118-135 | | 136-149 | 150-159 | 160-170 | 171-176 | 177-181 | 182-184 | 185-192 | 193-206 | 211 | 215 | 224 | 227 |
| 16-16 | | | | | | | | | | | | 1-74 | 75-80 | 81-98 | 99-170 | 171-275 | 276-362 | 363-530 | 531-554 | 555-680 | 681-936 | 937-1047 | 1048-1465 | 1466-1848 | 1849-2199 | 2200-2351 | 2352-2475 | 2476-2569 | 2570-2632 | 2633-2689 | 2690-2739 | 2740-2873 | 2874-3020 | 3021-3183 | 3184-3303 | 3304-3377 | 3378-3465 | 3466-3521 |
| HRS | 1920 | | | | | | | | | | | | | | | | | 1 | 2-9 | 10-34 | 35-70 | 71-149 | 150-325 | 326-482 | 483-531 | 532-569 | 570-582 | 583-585 | 586-589 | 590-596 | 597-601 | 602-619 | 620-644 | 671 | 686 | 695 | 703 | 711 |