The meaning of a 'R' AFTER the serial number is uncertain. We thought it might indicate the A.P. Curtis Forend Fastener used 1912 to 1920.
Dr. Stubbendieck however has found 'R' suffix SNs without Curtis FEs, and believes that it may simply mean that the shotgun has extractors rather than ejectors. During that manufacturing period, one column of the shipping ledgers contained an "E" or "R". Earlier and later, nothing was recorded in that column other than an "E".

1914 FW 12g non-ejector Field