No maker's marks on the gun at all? My big eight gauge Westley is an 1872 gun and has the oblong firing pins. I have never decided whether it is a pin fire to center fire conversion. If it is a conversion, I can't tell by any lack of workmanship. It is a mint gun and shows no sign of out of factory work. My gun fires conventional Winchester 209 primers just fine and I don't think it was made for anything other than a center fire primer, nor do I think yours was made for anything other than a center fire primer. What is your serial number? Mine is 4371 as I recall. Check the WR website for date of manufacture info. A letter may give you more information.
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