Charles Parker experimented with this gauge in the 1860's because the muzzle loading .58 caliber rifles were thought could be converted. I don't think there were ever any made for sale. lcjones
There were a very few 14 g Mdl 59s made by Winchester. It is an extremely rare gun.
50-100 USD
50-100 or so
The value of a London Fine Damascus 14 gauge double barrel shotgun marked JT Sang Ford depend on its condition. This gun in excellent condition is valued between 225.00 and 320.00 as of 2014.
He/They made shotguns as follows: 10 gauge 12 gauge 16 gauge 20 gauge 28 gauge .410 bore It is entirely possible that they may have made a couple examples that were 8 gauge or even 4 gauge, particularly as double rifles. They also may have made a few 14 gauge, 15 gauge and 24 gauge guns in their history. (obscure gauges from the 19th century for the former two, an obscure early 20th century gauge for the latter)
Assuming this is a firearms question- the 14 gauge shotgun is very rare today. The bore diameter is smaller than a 12 g, larger than a 16g, and runs ABOUT 0.695 inches. That converts to about 17.65mm. If you are seeking to convert wire gauge, or sheet metal gauge to mm, please repost with that information.
if it's 14-gauge then it's 14-gauge.
http://www.histandard.info/PDF/Sears%20Shotguns.pdf
14 gauge shotgun shells have not been commercially available in the US since the 1920's and there probably hasn't been a gun chambered for them made since WWI. If you want to give a little more information - like all the writing and symbols found on the gun, I can probably tell you a bit more.
I am not sure on the price because i am also looking for a price for i have a full box of FMC 14 gauge shells #7.5 shot. If interested e-mail @ jjbct@hotmail.com
14 gauge is thicker than 16 gauge.