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== mayralphie additional comments from forum ==There are always guns that will not conform to this table. In the "O" prefix guns, 1941 production, I found several guns with "42" dates that should be "41" dated. Enfield production was pretty consistant but these flyers do exist. In early production the barrel dates are usually the same year as the frame date or one year later. Example; 1934 frame date "34" or "35" barrel date. Several examples have surfaced with barrel dates one year before the frame date. Example; 1937 frame date "36" dated barrel, however these appear to be rare. The Enfield logo was dropped in 1941 somewhere in the high "M" through "O" prefix with the DI* mark being used after. Mk1 pistols were produced till 1939 when the Mk1* came into use. Many of the earlier Enfield Mk1 were later converted to mk1*. The Mk 1* was dropped in 1942 in the "S" or "T" prefix and the Mk1** was used till the wars end. Other small changes took place. In 1941 the barrel date mark was changed from horizontal to vertical and the back strap grooves were dropped sometime in 1944.Several guns have also been seen that had white painted numbers on the frame with heavy black paint finish. These guns all had frame and barrel dates that were farther apart then normally seen. example 1941 frame date "45" dated barrel. These guns all appear to have come from the same source and one gun was observed with an R.P.I. stamp on the cylinder. This mark appears to be from the Pakistan military and could mean these guns were part of the shippment to Pakistan in 1956-1957 discussed in Shennerton's book.FTR (Factory Through Repair) guns have dates of 52,53 or 54 with some of the barrels being re-dated to the FTR date. I have not seen any other FTR dates on these guns.Some pistols will display unit issue marks stamped in various places on the pistol. Marks onserved so far: RAF, RCAF, B2RE 24, 2SHROP, SB B, RPI, SOU 26.56.17, 1RHA,KBY 17, PH 527. Non of these marks are cylinder steel lot markings.