byf 42 question

[kunta]

I found a 42 byf that is said to be PORTUGUESE WW2 CONTRACT BYF 42 but on the photos I see no stamping that was not from the mauser factory. Is this something assumed? seller says that all of the 42 mauser lugers went to portuguese use. the mag is fxo with alumiinum bottom and not matching to gun, the grips are black plastic.