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150-175 depending on the condition and which barrel is on it
Remington automaster model 87 12 gauge is one of those cases that has got greatest importance, and that involves professional assistance regarding
Check the extractor pin that latches onto the rim of the shell to pull it out. I just was diagnosing mine and found the tip of it broke right off. It should be a fairly long little arm with a hook on the end attached to the action of the gun.
The 878 was discontinued in 1962
1959-1962
I have seen them selling for around $130, but condition would be a significant factor.
Made from 58-63. 100-300 USD
Impossible to tell without the serial number and all markings on the weapon.
Markings typically include model, The Remington trademark, date of manufacture, test marks, inspectors, and proof mark. In some cases it may be a factory repair mark, or indication of Magnaflux testing. See the link below for an illustration of barrel code markings. Note these are for REMINGTON only.
By the serial number and markings on the barrel.
http://remingtonsociety.com/rsa/questions/barrelcodes For date markings, the forums on the site for others.
Impossible to answer without a DETAILED description of ALL markings