Hi Bob, there are many things wrong with this Luger. First, it has been refinished judging the rounded corners, lack of machine marks and the barrel shine. The barrel doesn't have any proof marks that I can see. The small parts should be strawed and they are not.
The magazine is a center pin type and should be a single side pin type. It is numbered in the style of a Police Luger, but it has been renumbered.
The grips are ill fitting and are most probably post war reproductions.
No way this Luger is worth $1300, which is the starting bid. That is unless you want to contribute to the NC Baptist Fund.
Regarding the circles on the left side of the receiver - I don't have a clue!!
