That really depends on the condition. Take it to a gunsmith or appraiser or go to auctionarms.com to get an idea of what they are selling for.
The Ithaca model 66 single shot shotgun that was made from 1963-1978 was offered in 12ga,20ga and 410 gauge only.
shotgun
what is the value of 12 gauge skb double barrel ithaca 1900 model
Remove stock from shotgun
Double barrel? Single barrel? Model? Need more information in order to be able to answer.
model 37 around $500 in good condition
$600 all day long
You have a Lewis or NIG model, built in 1903.
Made in 1968
The question can't be answered without a sn.
Made in 1949
Made in 1915 - probably a Flues model.