That's a beautiful gun.
It's interesting my '54 Izzy exhibits the same really nice blued finish. Like yours the only obvious sign of refurb was the replaced stock- also off of a '54 Tula. The guy I bought mine from purchased it as an "unissued" gun very many years ago (he's been an ffl dealer since the mid-80's). He was surprised when I told him it was really a refurb. If res45 hadn't steered me to this forum I would've not questioned the "unissued" moniker based strictly upon the condition of the gun.