OneB,
I have a Husqvarna built on an FN action, with no distinctive marks on the receiver (pre-68 so not even a serial number). Some of the Santa Barbara actions were the same way (built on contract for another company), and I can only assume that the Zastava actions that were provided for other companies were supplied without adornment.
Still, it looks like a fine rifle, and if it shoots tight I wouldn't bother with it. The 35 Whelen is a fine cartridge.
Jimro