50-500 usd
No such model in the Winchester line. Remington has the 1100
$1100-$1700 depending on condition. 3rd model is worth slightly more than 1st & 2nd model
The Standard Grade Winchester Mdl 71 is valued at around $650 for GOOD, and $1100 for EXCELLENT condition. The value of ANY firearm is based on EXACT model, condition, and originality. Some grades of the Model 71 are worth more.
No such model in the S&W line.
$1100
100-1000 depending on specifics
There is a tube extension for a Winchester Defender 1100. Extensions include a 7 shot, 8 shot, and a 10 shot.
Neither.
Between 100-400 dollars,depending on overall condition.
50-350 usd
If you are willing to get your winchester model 21,28 gauge shotgun authenticated by a winchester facory letter,then this shotgun could range in price from 25,000-30,000 dollars because it is generally believed that less that 100 model 21 shotguns were made by the winchester custom shop during the production of the winchester model 21.There was a production of 32,500 model 21 shotguns made between the years 1931-1988.Only 1100 were made by the winchester custom shop.You may get a letter on your winchester model 21 shotgun by contacting the the Cody firearms museum located in Cody,Wyoming.I would certainly have this shotgun valued by a qualified winchester collector assoc.member.
I know very little about model 12's but I do have a 16 guage with a 24" barrel chambered for 2 9/16 old paper shell.