What is this?

[DavidJayUden]

If you are going to shoot it at all then buy an aftermarket Mec-Gar magazine. That wood base magazine would be good trading stock against a period correct magazine, but personally I'd not be paying "retail" prices on a mag. The money just won't come back to you.
Not sure which mag is correct for it, but figure $100 minimum. Yours should be worth that or more, and Mec-Gars, $30?