Impossible to attempt to answer. With make and model we MIGHT be able to give a range of dates, without them, no way. Sort of like "I have a 6 cylinder car that was made in Detroit- what year is it?"
Gun smith, gun shows.
Impossible to answer without a detailed description
Depends on who made it, accessories, condition, etc.. Could be 100-10000 USD
Please reply to the address below with ALL of the markings on the rifle. sales@countrygunsmith.net
I assume your single action is pre-war ? If so, then made about 1907. As to the caliber, check markings on barrel. that should give the caliber.......
I believe I have a Marlin No.18 pump action octagon barrel single shot rifle. Would upload photo but cannot locate this option.
One POSSIBLE maker (you did not give us a lot of info to work from) was Anciens Establishments, Peiper of Herstal, Belgium. If you gun has a small marking of the letters ELG in an oval, that is the prrofmark for Liege, Belgium.
I highly suspect that the rifle has an octagon (8-sided) barrel. The October 7th, '79 patent date strongly points towards the rifle being a Browning or Winchester Single Shot rifle. The serial number on the barrel or the lower tang will help solve the mystery.
50 USD
No that's probably a serial and while some may have a prefix others models done and they are not unique. A start would be any writing on barrel or elsewhere, caliber if known, type i.e. single shot, pump, auto, revolver... Basically the best description possible including barrel length, shape (round/octagon).
Somewhere between $30 and $3000. Everything depends on make, model, and condition.
Could be a lot of things, is this a pump, rolling block (single shot), need more details, barrel length, take down, etc.... Also it's often referred to as Octagon but it's not it's Hexagon, off hand I can think of no manufacturer that ever made a Octagon barrel.