Its hard to place a value on any firearm without a great deal more info than just model and make. Condition is all important and rarity. The model 1900 can range from a junk $150.00 wall hanger to a $500.00 steel barreld shooter. more with certain rare features
Steel or Damascus barrels?
how much is a remington umc 12 gauge serial number 247442
between $200 and $1100.
100-350 or so
250 USD if in good condition
100-300 USD
The exact value of a Remington Sportsman 12 Magnum actually depends on a couple things. Some of these things would be the condition and age of the Magnum.
It's described on the Remington Society of America forums... http://remingtonsociety.com/forums/
Tough question, the Remington model 550 is a .22 rifle not a 12 gauge shotgun.
Crescent. H&D, Folsom, Browning, Winchester, Remington
$300.00
Remington didn't make a Model 12-2 but Model 12-A-F & and CS. But the value is GREATLY dependent on condition without that it's anywhere from a 200-1,200 gun NIB.