It's easily worth that if it hasn't been chopped and/or sporterized.
Make sure it hasn't been converted to 8x57 before you try to shoot it. Also, if it is still in original calibre, see if the magazine cutoff device is still intact and operational. The Turk Mauser differs slightly in externally appearance by having a slight "belly" at the bottom of the magazine that protrudes below the level of the stock. The other distinguishing feature is the cutoff mechanism itself, which is visible from the right side just below the receiver. See attachment. (Although the photo is actually of a 1933 Ankara 8mm conversion, the mag cutoff is plainly visible.)
7.65 ammo, while not super common, is still available enough as many Argentine Mausers have been imported over the last several decades in that same calibre.