"Mystery" Commercial Navy @ Legacy
 

I think the frame serial number is altered on this one. The 5th photo shows the receiver protruding beyond the frame by a little. I suspect that someone filed off the original serial number, and then applied their own. That would explain the shorter frame, loss of finish in that area, and the "mystery" serial number.https://www.legacy-collectibles.com/...m%20luger.html

Hi Doug,
"Commercial Navy" is a misnomer. It's a Commercial assembled from left-over parts after the war.
Norm