I would treasure that rifle.
The only experience I can offer is based on living in Germany 1989-1991. American calibers were offered and quite common - and seeing where the rifle was a gift to someone returning to the US, it comes as no surprise that its a .270. The principal marking for your rifle has been covered up by the front scope mount base. If I were you, I wouldn't obsess over what it is - just know that it's a fine rifle. A good gunsmith can confirm the rifle is indeed .270 Winchester. Once that is known, get some ammo and see how it shoots.