it is a 410 ga pump shotgun
The Marlin model 24 shotgun was produced by Marlin from 1908-1915.
Marlin Model 49 Exposed Hammer Pump Shotgun, 3000 made 1925-1928 for stock purchasers only, 12 gauge 2 3/4" with 30" barrel, 4 round magazine
Marlin
You have a Marlin model 1896 slide action shotgun, however, it is a Blackpowder shotgun and you will need brass hulls.
The Marlin model 24 pump action shotgun was produced by Marlin firearms company from 1908-1915.
The Model 49 was a variant of the basic Marlin pump shotgun produced on the 1889 patents. The Model 49 was made in the late 1920's and was primarily an incentive gift for stock purchasers. Due to several different potential problems with the action, Marlin advised owners of these guns not to shoot them.
Look up the Marlin shotgun with the same model number.
50-150 USD
$1,000,000.00
Anywhere from 200 to 500 depending on condition
50-250 usd