By the serial number.
If it is in very good condition it might bring $350- $400. The .410 and the 20 Ga are worth more than the 12 Ga models.
1913
1961
Made in 1965.
Depends a lot on the condition. The paint on the receiver of these models tends to peel pretty easily. I have seen this selling for about $125 - $150 recently, with 20 GA and .410's selling for more than 12 GA typically.
$8,000-$10,500
Made in 1937. If in very good condition it may bring around $500, since the 20 GA is rarer than the 12 GA.
200-500 depending on condition
go to a sight www.corsonsbarrels.com ==New Answer == Or look on Gunbroker.com. I have seen these barrels there frequently.
Call Ithaca at 1 877 648 4222 for answer.
what is the value of a Ithaca 12 ga shotgun