Mike, I'm not qualified to judge the but-plates originality. What I would look for is does the wear on the plate match the rest of the gun. Others with more experience would know which dogs on the plate are right for the era. I didn't see a size # on yours and I don't know that a size # was used from the beginning when PB switched from metal plates. Others have said that PB chalked the sn on the inside of the plate and I've observed that this is true. Obviously in this case if the plate is original it would have been wiped off.
Erick
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