Generally, you can't. If you can identify the model, you can determine the years in which it was manufactured, and sometimes narrow that down by variations in the model's specifications.
I am pretty sure the Wards Westernfield Model 53 was made by Iver Johnson. Externally the Model 53 and Iver Johnson Hercules look identical. I believe the Iver Johnson Hercules was made from 1918 to 1936.
Hercules was made by Iver Johnson from 1918-1943, Hercules name dropped in late 30's!
The Iver Johnson Hercules grade hammerless shotgun in 410 gauge was made from 1924-1935 by Iver Johnson.With the serial number that you possess I would assume that it was made early on during production.
I'm not sure if it's a champion but I do own an Iver Johnson 24 gauge shotgun...single break action...I beleive they were made between 1909 to 1913... my grand father first gun at 14 yrs old...
These were made by Iver Johnson company. Try searching gunpartscorp.com under Iver Johnson,
If you are refering to the Iver Johnson model excel shotgun,which was made from 1910-1935;then these shotguns were chambered in 2 3/4 inch shells.
The Hercules shotgun was made by Iver Johnson (not Stevens, which is a totally different company) from 1918-1943, although the Hercules name was dropped in the late 30's.
If you've ID'd it as an Iver Johnson product, I'd guess it is a Champion model which was made from 1909 to 1956. I think Sears may have dropped the Eastern Arms name sometime earlier than that, probably in the 1930's.
I can say that the Iver johnson target model small frame(,22cal)was made from 1925-1928.The iver johnson target large frame(.22cal)was made from 1921-1941.
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The Iver Johnson .22cal supershot automatic model 90 witch you describe was made by Iver Johnson between the years 1932-1941.
They do not make a nine shot pistol made by Iver Johnson. These pistols were available in the 1940s.