Although you say the stock was replaced, it looks like a Parker stock. Better pictures of the side view of the front end of the stock with checkering would tell us more clearly. With a skeleton buttplate, it would be unlikely anyone but Parker would have done the work. There are surviving records at PGCA on your gun, probably order book entries since the stock book with your gun is missing. The order book has the interesting information like the name of the original purchaser, the configuration of the gun when it was made, as well as possibly repairs, restocking, or modifications made to the gun up to 1919.
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