A variant of the Stevens Favorite Boy's Rifle. You dont mention anything about the condition of the rifle, so we can only estimate a range of $70 - $350. Digital pictures would be helpful.
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If it is a single-shot, $75-$150. Double barrel, $150-$300.
I do not personally, but yes, there is a single shot rifle that can have the rifle barrel replaced with a shotgun barrel.
Somewhere between $30 and $3000. Everything depends on make, model, and condition.
Single shot, 24"barrel, value from 50-150 depending on condition.
Model ? Condition, condition, and condition ????
Depends on who made it, accessories, condition, etc.. Could be 100-10000 USD
Condition?
Yes it is. It is a single shot .177 pellet rifle. It is not a BB rifle.
Generally, no. While single shot rifles MAY have the rifle barrel replaced with a shotgun barrel, reverse is not true (usually) A rifle cartridge generates much higher pressures than a shotgun shell.
Can't be answered without a DETAILED description of ALL markings, barrel length, caliber, sights, stock material, box, papers, accessories, history, finish, overall condition, etc..
Not sure what brand/model you are referring to- but the most "skeletonized" 22 rifle I have seen was an all metal single shot twist barrel gun made by Garcia- the Bronco. They are $75-$150, depending on condition.
The value of a Winchester Model 67A boy's rifle with a 20 inch barrel depends on its condition. This gun in excellent condition is valued around 100.00 as of 2014.