I am looking for some help identifying this gun. Based on my research it seems to be a french gun. I was told that it was 16Ga. and I think it has 2 3/4 chambers (the 17.1 proof, the 70, and it chambers 16Ga. 2 3/4 shells fine.) I think it is proofed for smokeless powder (the PT under the crown.) 
Am I correct? Is there anything else that someone can tell me from the proofs.
I am also looking for a good gunsmith in the Norfolk, Virginia area to check it out before I shoot it.  
 
    
     
     
    
    
     
  Thanks for any help you can give me.
Stephen