I just received my new to me Janssen Fils & C SxS. Well kinda received..for the 5th time this year my approval has been "Delayed". I know I need to get my CWP.

I have been trying to decipher the Proof Marks.
I figured out:
Black Powder proof.
Choke xx.x post used post 1924
S# 89736
Gauge & Length 20/70 post 1924

But nothing else, including the date and the smokeless proof

I was hoping to shoot it this weekend but now I have concerns as I am new to the Older guns

Thank you all so much

Jim