The Lefever was mfg. in 1935.
If it is a double, remove barrel and you will see it along with serial #.
No way to answer without knowing who made it, all features and condition.
Turn of the century.
i have a shotgun double barrel, i think it maybe 12gauge with Richard or righard on the plate below the barrel, the butt of the shotgun has browning automatic on it, which made me think it was a browning, but it is not...can you help me id the shotgun and what the value is
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.