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1927
The Lefever was mfg. in 1935.
If it is a double, remove barrel and you will see it along with serial #.
around $6000
Requires professional appraisal.
Lefever made several models through three different versions of the company. Not enough information.
Turn of the century.
The best that I can do is say that the Lefever Nitro special was made from 1921-1948.
Blue Book of Gun Values
To get a parts breakdown you would need to take the shotgun into a gun store. The store will be able to provide an estimate, or order new parts.
150 dollars
The JStevens Arms Company Model 235 double-barrel shotgun was made from 1912 to 1932. However, there were no guns made by the company from 1916 until 1920.