according to the book 39973 is grade 0 10 guage with plain twist 30 inch barrels - capped pistol grip. with no extras, so it should have extractors. A pretty basic gun for the time. The pictures are a little fuzzy, condition is a little hard to determine.
how are the barrels on the inside? how much pitting is in there?
i'd put a 1884 gun at about 128 years old
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just realized this info was on the other post for this gun/poster