Go to Google, select IMAGES from the toolbar, and for search term enter Iver Johnson double hammer shotgun.
Iver johnson
It should be marked on the barrel or recieiver.
There is no "break in" shotgun. A "break open" shotgun is a single barrel, double barrel, or combination rifle/shotgun which breaks open in the sense that a lever will unlock the action, allowing the barrel to pivot at a hinge at the front of the receiver, pivoting the rear of the barrel up to expose the chamber. A shells may be loaded into the chamber and the barrel pivoted back to close the action. The act to "break in" a shotgun means to fire it a few times to loosen it up.
$50-$125
iver johnson made for a ohio sports store
In reproduction catalogs from Sears @ turn of the century
Go to google and enter "20 gauge double barrel shotgun" then click the (images) button at the top of your screen. Then hit (search images).
yes they made a martini action single barrel shotgun 12gauge it is cheap around £100 but it has a huge amount of recoil you can buy them on guntrader.com
how old is my Iver Johnson single barrel shotgun champion model 3578 C with a 12 gauge choke bore barrel and lug forged in one and approximate value .
Yes, the barrel on a Remington Model 48 shotgun does move back into the loading chamber when fired. This movement is part of the semi-automatic cycling action of the shotgun.
Your Iver Johnson double barrel shotgun can be dated by the words hammer forged.This places production from 1936-1941.these were well made mass produced field grade shotguns of high quality.
In order to answer your question correctly,I would need the maker of the shotgun,shotgun model,and type of shotgun we are talking about(pump action,single shot,semi-auto etc.) I would also need to know what type of barrel you have(plain barrel,solid matte rib,or vent rib barrel).also include the overall condition of your shotgun and amount of blueing remaining on the receiver and barrel.