Only meothod I've found is to look in the used value books that have pictures of the gun you are looking for. Match the gun with the picture and description and the model number will be shown right there. Sometimes it takes a lot of looking.
200,375
My dad and I bought a Stevens Mod. 940 single shot 16 gauge at a hardware store in 1950. model # 940
How old US a Stevens savage model 530a 16 gauge
You might find what you need at webdept@gunpartscorp.com .
It was manufactured in the early-mid 60s.
Stevens Model 940c was manufactured between 1961 and 1970. If your shotgun has no serial number then it was made before 1969.
Utility single shots seem to retail for about $75-$80.
What is the value of a Stevens model 940b 16 gauge single shot? And when was it made?
it was made in or around 1972
try looking at savage or Stevens shotgun diagrams. I found a firing pin for a 16 gauge riverside it was an old model 94 Stevens part
about £120
The stevens model 9478 shotgun was made between 1978-1985.