My New Luger P.08 has finally arrived! byf 41, Help Needed

[Lugerdoc]

Frank et al, the E/655 acceptance mark PRECEDED the E/135 and the 1941 PO8 range began in the "n" suffix block with 42 code mid toggle links. So a BYF with E/135 would be LATER 41 production. Mauser did not start each years production at 1 no suffix, as was the case in WW1 production. TH