This is what we need Rich:

1904 - 1925 (No chamber length) 1925-1954 would be similar but the chamber length would be marked

[Linked Image from photos.smugmug.com]

1954 to 1989 with the Birmingham date code of GB = 1956

[Linked Image from photos.smugmug.com]

Send a high resolution full size image to drewhausemd@yahoo.com