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Dates of Production by Model and Serial Number
for

Model 1911A1, .45 ACP

Year
Serial Number Range
Manufacturer
Number Produced
1924
700001-710000
Colt
10000
1937
710001-711605
Colt USN, USA
1605
 
711606-712349
Colt USN
744
1938
712350-713645
Colt
1296
1939
713646-717281
Colt USN
3636
1940
717282-721977
Colt
4696
1941
721978-756733
Colt
34756
1942
756734-793657
Colt
36924
 
793658-797639
Colt USN
3982
 
797640-800000
Colt
2361
1941
S800001-S800500
Singer
500
1942
H800501-H800100
Assigned to H&R
0
 
801001-856100
Colt
55100
1943
856101-958100
Colt
102000
 
856101-856404
Replacement Nos
304
 
*856405-916404
Ithaca
60000
 
*916405-1041404
Remington Rand
125000
 
*1041405-1096404
Union Switch
55000
 
1088726-1092896
Colt
4171
 
1096405-1208673
Colt
112269
 
1208674-1279673
Ithaca
71000
 
1279674-1279698
Replacement Nos
25
 
1279699-1441430
Remington Rand
161732
 
1441431-1471430
Ithaca
30000
 
1471431-1609528
Remington Rand
138098
1944
1609529-1743846
Colt
134318
 
1743847-1816641
Remington Rand
72795
 
1816642-1890503
Ithaca
73682
 
1890504-2075103
Remington Rand
184600
1945
2075104-2134403
Ithaca
59300
 
2134404-2244803
Remington Rand
110400
 
2244804-2380013
Colt
119450
 
(2368718)
Last Colt
 
 
2380014-2619013
Remington Rand
85126
 
(2465139)
Last Rem Rand
 
 
2619014-2693613
Ithaca
41305
 
(2660318)
Last Ithaca
 

* Colt duplicated the following serial number blocks:
60000 pistols in the Ithaca range 856405-916404
41696 pistols in the Remington Rand range 916405-958100
4171 pistols in the US&S  range


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