Sir:
Your gun is proofed with 3" chambers for 1 1/2 oz. loads at nitro proof, Birmingham. It carries both Birmingham "View" and black powder proofs per original testing. There is supposed to be choke in both barrels per the 12/C diamond stamp. And the word "CHOKE". This is no guarantee there is still choke however. The 13 over 1 is an earlier mark meaning the original bore size was 13 bore plus about .010 inches. A bore mic would reveal how much of this information still applies. The WL is the fellow who made the barrels... whom I can't remember just now.
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