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If it is not marked on the barrel, you should have a gunsmith measure the chamber length.
$35 to $75, depending on condition.
It is a Stevens Model 1929.
You will have to contact RTM to find out.
Made by J Stevens Arms between 1920 and 1948.
Under $100. sales@countrygunsmith.net
Blue Book of Gun Values, on line auctions.
If it is a typical Stevens double or single barrel there should be a metal lever towards the back of the stock slide it left or right and tilt the barrel down.
That patent date was used by J. Stevens Arms and Tool Co, but I can't find 376 listed as a Stevens or Savage model number. Could have been made for a hardware store or mail order business and marked with the model number requested by the retailer.
Single shot breakopen? $35 to $100.
depending on what parts you kneed a good gunsmith can make the parts you need.
There have been several variations of the company name, but never just "J Stevens". The "Springfield" name was used from 1920 until about 1948 and during this time the company was called J. Stevens Arms Co. The type is determined by looking at the gun: single shot, double barrel, pump, etc. The gauge, if not marked on the barrel, can be determined by measuring the chamber. 147K MAY be the model number. I have not found this model listed in any of my references, however if it is a single shot or double barrel, few models differ significantly from others, so many are not listed individually.