NP, It's true that some of the last produced 42BYF PO8 in the M & N suffix blocks did go to Portugal. Where is the E/135 on your barrel? If on the left side, if is probably the orig barrel. If on the bottom, it may be a later Mauser spare, replacement. If the 9 is in a circle, the barrel was replaced in Portugal. Some detailed photos would help. TH
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