There are three manufacturers that made the K98/ZF41 system . Mauser Oberndorf ( byf ) Mauser Borsigwalde ( ar ) Berlin Lübecker Maschinenfabrik ( duv )
Year and maker : 1941 - ar41 - duv41
1942 - ar42 - duv42
1943 - ar43 - byf43
1944 - ar44 - byf44
1945 - byf45
At this moment I have found no proof that Mauser Oberndorf ( byf ) made K98/ZF41 in the year 1941-1942 . IMO. they started the produktion in the year 1943 . Someone seen a byf41 with flat base ?
Berlin Lübecker Maschinenfabrik ( duv ) ended production in 1942 . By the end of 1943 , Mauser Borsigwalde ( ar ) had enden production of completed K98 rifles at the plant . Mauser Borsigwalde ( ar ) did continue to supply limited quantities of receivers marked "ar44" and WaA135.

ar41 - flat rail

byf 43 - groove rail

byf 44
These WaA only find on byf

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