Start by giving us the rest of the information stamped on the gun, but since you posted it under "Springfield", I'll assume it is marked with that name. If so, it was made sometime between 1920 and 1948 by the Stevens division of the Savage Arms Co.
There is no way to answer your question, due to lack of information on make and model. Serial numbers are not unique to a single firearm, and several different makes and models may have the same serial number.
about $100
A gun with that serial number. That's as much of an answer as can be given with the information provided. Serial numbers are not unique to one firearm, and may not even be unique to one firearm in a single manufacturer's lineup.
There isn't enough information to answer this question. Serial numbers are not unique to one firearm - they may not even be unique to one firearm from a single manufacturer. Several guns could have that serial number.
You can find information on the American Gun Co. Victory Ejector 12 gauge single shot serial number 294000 online at places like Shot Gun World. You can also find information and pricing on Gun Broker.
made 1904.....................
Impossible to value anything with just the sn and no other information.
A Colt single action 1860 army with that serial number was made in 1866.
Your colt single action army dates to 1881 with the serial number you provided.
There are probably several guns with that serial number. Serial numbers are not unique to one single firearm - they often aren't even unique to one firearm from the same manufacturer. We'd need a lot more information to determine what type of firearm it is.
when did spring make 12g single barrel shotgun serial number 30368
Your serial number indicates that your Ruger Single Six was made in late 1975.