Sounds like either an 1899A or a 99B (not to be confused with the 1899B), but most likely an 1899A.
Secondly, I'd just leave it as is unless you really want the cresent butt. Savage 1899's were all numbered on the buttplate, butt stock and forearm to the receiver. Most collector guns haven't been touched but yours has already been made into a shooter grade gun as the numbers will never match again so just shoot it and enjoy.
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