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The Lefever was mfg. in 1935.
If it is a double, remove barrel and you will see it along with serial #.
around $6000
1927
Requires professional appraisal.
Made in 1904. Value depends on grade and condition.
Turn of the century.
The best that I can do is say that the Lefever Nitro special was made from 1921-1948.
I own a London Fine twist double barrel shotgun in fair condition, it was rated at $100.
The Stevens double barrel shotgun is worth $350 to $450 dollars. The value is determined by the gun's mechanical condition.
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.