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You will have to contact Marlin to find out.
Your Marlin model 81DL was a promotional model that was made by Marlin from 1940-1965.These range in price from 65-100 dollars.
Marlin probably has one and most likely won't sell it to you.
200-400 USD
The Marlin Model Golden 39A is the oldest and longest continuously produced shoulder firearm (rifle) in the world.