best bet for older gun parts is gunbroker.com they sell most everything gun related
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 made the model 1898 shotgun,while Winchester made the Model 1897 shotgun,A Winchester model 1897 shotgun with the serial number provided indicates that it was made in 1900.The Marlin model 1898 shotgun was made from 1898-1905.
100-300 USD
Look up the Marlin shotgun with the same model number.
Your Marlin model 59 single shot shotgun is valued at between 40-100 dollars,depending on overall condition and a good bore.
$1,000,000.00
depending on condition....$80-$100
50-250 usd
100-300 USD
1949.
The Marlin model 30G serial number 3512 20 gauge shotgun is valued at $350 in good condition. It is valued at $750 in excellent condition.
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.