My M2, serial No. 2088, has what appears to be the number "8" in the recess.... the only mark there. (The top of the "8" may be slightly open but it's difficult to tell, really, as it's not stamped too well.) The circle-triangle Portugese proofs appear on mine in the same places as Pete's. I bought my rig from a man who purchased it when they were first imported back in the late 1960's.
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