Depends on condition and features. $75 to maybe as much as $250.
I found a set for my Enders Special Service a.k.a. crescent on eBay of all places. It took some time and alot of questions, pictures and measurements but was worth the wait. There are many barrel sets that will fit with a little tinkering.
I was offered $500.00 for mine.
695.00
Wall Hangers
100-400 USD
50-150 USD
50-1000 or more depending on specifics
50-125 USD
Blue Book of Gun Values
50-500 uSD
You won't find history of any particular Crescent double barrel model. They basically made one or two models and marked them with whatever name the retailer wanted. Well over 100 different trade names have been found on Crescents. The company was formed in Norwich, Ct, in 1892 and bought by H&D Folsom Sporting Goods the following year. Around 1926 Crescent was sold to Stevens (which was already owned by Savage) then merged with NR Davis (which they also purchased) to form Crescent-Davis Arms. The Crescent name disappeared completely about 1932.
Single shots, $50-$75. Double barrel, $150-$250.