M1 helmet shell dating (heat stamp)

Batch number Production date
0-100 01/1941 – 03/1942
100-200 04/1942 – 06/1942
200-300 07/1942 – 09/1942
300-400 10/1942 – 12/1942
400-500 01/1943 – 04/1943
500-600 05/1943 – 08/1943
600-700 09/1943 – 10/1943
700-800 11/1943 – 02/1944
800-900 03/1944 – 05/1944
900-1000 06/1944 – 08/1944
1000-1100 09/1944 – 11/1944
1100-1200 12/1944 – 02/1945
1200-1300 03/1945 – 06/1945

A letter was issued in sequential order at the time each individual lift of a given heat was received for processing: A for first lift, C for third lift, etc.

Production numbers

Year Amount
1941 323.510
1942 5.001.384
1943 7.648.880
1944 5.703.520
1945 3.685.721