@ turn of the century plus or minus a few decades
What was the question?
0-75 bucks
1900-130 or so.
Crescent made inexpensive "working" firearms 70-100 yrs ago
50-150 USD
if its a single shot, then 75-150, a double barrel possibly 300
From the 2002 Standard Catalog of Firearms: In 1905 Crescent's first hammerless sidelock was introduced as the American Gun Co. "Knickerbocker" Model No. 6. This very popular model became the Crescent "Peerless" No. 6 in 1922. In 1928 it became the Crescent "Empire" No. 60. and in 1931 the Crescent-Davis "New Empire" No. 88, "New Empire" No. 9, and "Empire" No. 9. For further information about Crescent Firearms of Norwich, Connecticut try Amazon.com or eBay for books on old firearms companies.
$100-$250
No new parts would be available, but a competent gunsmith could probably make one.
These single-barrel Crescent shotguns range from < $50 as a parts gun, to maybe $100 if in excellent shape.
go to gunstocksinc.com then look under misc. shotguns the fore arms are $25.00 i just ordered one myself
Crescent Firearms, sometime between 1888 & 1929. Crescent Firearms Co. was started in 1888 by George W. Cilley. These were made for and sold by a variety of hardware companies, mail order stores, retailers and distributors. Nearly 100 names are known or thought to have been used on shotguns produced by Crescent. In 1929 N. R. Davis Firearms Co. merged with Crescent to become Davis-Crescent Arms Co.