The only Crescent shotgun that I know of that was nickeled was the 20 guage, 14 inch barreled Knickerbocker. A shotgun with a barrel length of 18" or less requires a Class C license from the federal Bureau of Alcohol, Tobacco & Firearms. Assuming you are correct and it is a 12 guage, it was originally blued and parts should be available from http://www.gunpartscorp.com.
Compeer Gun Company was a trade name owned by Van Camp Hardware and Iron Company, Indianapolis, Indianna. These guns could have been made anytime between 1892 and 1932.
COMPEER was a tradename used by the Van Camp Hardware& Iron Co located in Indianapolis IN. The guns were made by Crescent Firearms and distributed by HD Folsom from 1893-1910. Value will be up to $200.
deer compeer
deer compeer
Your shotgun was made by Crescent Fire Arms Company and store branded by Van Camp. 50-150 USD at the most.
You won't find a price guide. They're just utility shotguns made for Van Camp Hardware by Crescent Fire Arms Co. Single shots would be worth $25 to $75 and double barrels $100 - $250, depending on condition.
Turn of the century or so
Try the Blue Book of Gun Values.
50-100 USD
50-100 USD
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CREATOR Chapter Curator Clipper Camphor Chipper Chopper..... there are many more. Creator, conquer, curator, compiler, compeer, clyster, cluster, cudbear