"Lancasters pattern centrefire and pinfire .410 shot cartridges first appear in Eley Brothers Ltd. advertising flysheets in 1857. By 1874 Eleys were advertising modern centrefire .410 cartridges. It appears to have become popular around 1900" Wikipedia said this about the .410 cartridge... Could possibly give some clues on the age of the Springfield model 18. For instance, the first .410 cartridges were developed in 1857, meaning the model 18 was made between 1857-present. We know it isn't modern, and that the cartridge became popular in 1900, so here is my educated guess: the Springfield model 18 is anywhere from 65-100 years old. Not a very specific, but I hope this helps your research.
1941
A" designates single shot.
i have a model 940 E 410 shotgun how old is it and what is it worth
Made by Savage/Stevens, similar to the Model 39A. Figure 1940's. sales@countrygunsmith.net
The winchester model 42 was a .410 pump very like the old model 12 pump
No sn data published
35 years old
The Stevens model 944 was made from 1936-1942.
No sn data
How old is the wenchester rifle
Your Stevens model 77F was produced from 1955-1971.
Can you put a scope on a western field model sd 14 a