These are the rifles that started it all(Brno #1,2,3,4,5 and later CZ-452): #1 (are from various sources)in original clothing: in a beechwood stock(many have been dress-up with later model walnut stock), they have a express sight(which is a pitty not to see on the CZ 452's)trigger was to be improved in other later models, magazine system has remained the same. Scope rings are the same as the CZ-527(.22 hornet, .223 Rem., etc.)Parts are still available thru Gun Parts(Numrich)in small quantities. Many parts are non interchangeable from #1 to CZ-452. All in all an excellent classic rifle which in the long run will give you more than your moneys worth.
Hoping this helped you out,