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Glenfield,which was made by Marlin Firearms Company made a bolt action .410ga shotgun from 1956-1965.This was the marlin model 59 which is the same shotgun as your Glenfield model 60.
Look up the Marlin shotgun with the same model number.
Go to Cheaperthandirt.com
It has value as a shooter only - not a collector piece. $100-$200.
Bolt Action 12 gauge mod 50.You can get one in geat condition for about $80 to $100.
Do you have the pump shotgun or the lever-action rifle?
its a gun.Your Marlin model 778 shotgun is a slide action shotgun chambered in 12ga.Magnum.It was available in barrel length,s from 20in.to 38inches.It weights 7 3/4lbs. and was discontinued in the year 1984.Yours was made by Marlin sometime between 1969-1984.
It is worth $75 to $135 depending on condition.
Actually the shotgun uses 16 gauge shells i have the same shotgun
About 100 USD.
You need to take it to a gunsmith so it can be thoroughly checked.
Bluegrass 12 gauge shot gun model 1900