It's most likely not the ORIGINAL mount, but it is a TULA made mount. Tula mounts were originally stamped with the rifle's serial number. During the refurb, the original number on your mount was polished off, mount was re-blued, and then the new numbers added.

Here is what the numbers on the Tula mounts originally looked like...


Note that on this rifle, when it was refurbished, they used the original Tula mount number and added the EP'd mount number to the rifle's receiver!