It depends on the year, manufacturer, and condition, but if it's a genuine antique and in good condition, you should be able to get at least $1,500 for it.
Parker 12 ga muzzleloader
Gun shop, gun show, Shotgun News, Gun List
sawed-off double barreled 12 gauge Remington shotgun.
The double barreled red chieftain of course!
50-100 or so
Diana Moon Glampers shoots and kills Harrison Bergeron on live television after he declares himself an emperor and tries to overthrow the government in the story "Harrison Bergeron" by Kurt Vonnegut.
Stephens
'Granny' used a double-barreled , 12-gauge shotgun .
No.
Stevens Arms made the Ranger shotgun for Sears & Roebuck. Production ended about 1930.
Probably early 1900's
Just another model in the Stevens line.