The Erfurt receiver with the two empty crowns indicates an armory replacement spare part. S/42 stamped on a part other than the toggle is the mark of a Mauser-made replacement part. It is not usually seen in this postion on replacement part barrels.
The receiver eagle is highly suspect. Stempeln (the dies for stamping metal) are easy and cheap to have made, which is why fakery in firearms collecting can be so attractive.
It will be very interesting to see the closeup pictures.
--Dwight
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