$150-$250, depending on condition.
1931-41. $150-$250.
It won't have one since Stevens didn't serialize their inexpensive shotguns until the GCA of 1968 required it and the 5100 was made c. 1931-1941.
My experience for similar guns (like Stevens 311, Stevens 5100, etc) is that your gun is likely worth 250-300 in good condition with little room for movement either way given bad (but working) condition or excellent condition.
The value of ANY firearm is based on the exact make, model and condition, You did not give us enough information (serial number provides none of the 3 items we need). Eastern Arms was a brand name used by Savage for guns sold mainly by Sears. Value in good condition is likely around $100.
My grandfather recently gave me a Stevens 5100 double barrel 12 gauge and I did a little digging and found that Stevens produced the 5100 from 1931-1941. Value, I'm not sure about. I havn't had mine appraised yet. Shoots nice though :)
It was made from 1931 to 1941. Value for a 12 or 16 gauge would be $150-$250 in useable condition. A .410 or 20 gauge could bring twice as much.
That's an older gun, should have the chamber length checked. In good usable condition, about $200-$225. www.countrygunsmith.net
$150-$350 depending on condition. sales@countrygunsmith.net
Is that the serial # or model #? I have one marker 19HF on all separate parts. My thought was that is the model. But my other id # is 5000, so what are the odds we have the sane gun model 1oo units apart?... Value is $150-$250 depending on condition. Less if it is broken or rusted and a little more if like-new. The 5000 and 5100 are not serial numbers. I'll bet my JC Higgins 16 gauge looks just like your guns and it is also numbered 5100. Stevens introduced the Model 5000 (in 1923 or 26, depending on which reference you believe), changed the model number to 5100 in 1931, and then to 311 in 1941. This gun was manufactured until 1989. The Springfield name was discontinued in 1948.
5100 is the Stevens model number, not a serial. These were made c. 1931-1941. The plastic was called "tenite" and often broke.
Stevens 5100 was manufactured from 1931 until 1941
If this is the Colt 1878 Frontier model serial # 5100 , then it was produced around 1881.