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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
Turn of the century.
Not clear on the question. There are no lever action double-barrel shotguns. There was a 'LeFever' in a few different variations, is that what you have? sales@countrygunsmith.net
Requires professional appraisal.
The best that I can do is say that the Lefever Nitro special was made from 1921-1948.
Ithaca bought Lefever and that gun is the Lefever Nitro Special. My gun has a pointer on it and 2 ivory beads, one midway on barrel. Also my gun has a rosewood stock on it. Special made gun for somebody. Lefever gun had ducks flying over a marsh on receiver.
Lefever made several models through three different versions of the company. Not enough information.
A 5906 what? As a general rule, barrel bushings are one piece and do not disassemble. I am Sorry...: How do you "remove" a S&W 5906 barrel bushing ?? It sounds like an after market barrel of some type. The 5906 does not have a barrel bushing. The barrel is "belled". www.alpharubicon.com/leo/breakdown5906.htm This link will show you how to disassemble it.
An early model Lefever single-barrel 12-gauge shotgun with a 30-inch plain barrel can be found for sale online for $300. This is the price for one that is in excellent condition.