The gun needs to be stripped and cleaned, particularly the gas system. repair@countrygunsmith.net
An Ithaca model 51 magnum 3 inch shotgun is worth $275-$325, depending on condition.
50-500 usd
44
The Ithaca rifles are rimfire. Most are .22LR, but there is at least one .22 magnum.
450 for the matte finish and 575-600 for the gloss
Kel-Tec manufactures a Model PMR-30 Semi-Auto pistol chambered for a .22 Magnum cartridge (.22WMR) with a 30 round clip capacity.
Check catalogs from major makers. 22 mag semi autos come into and go out of style regularly
.12 and .20 Gauge, and they also came in Magnum models. The .20 Gauge models are the rarer of the two, and the Model 100 was actually manufactured in Japan by SKB and marketed by Ithaca.
$800 to $1000 depending on the condition.
It can use either 44 magnum or 44 special
Yes. .22LR or .22 Magnum are quite popular for semiautomatic handguns. Walther, Colt, Browning, Beretta, Ruger and many more companies make .22LR autos.
The Model is "37," with the grade identified by a name (such as "Featherlight" or "Deerslayer") or a letter. Otherwise, it is a Field Grade, either Standard (2 3/4" chamber) or Magnum (3" chamber). I am aware of no public listing of Model 37 manufacture dates, but IDSA Books publishes Ithaca Featherlight Repeaters. They're on the net. However, your serial number denotes a fairly recent manufacture). 1973