I got this from an older gentleman that bought it 20 years ago. He said it was busted up when it arrived but he couldn't remember what kind of gun it was. Gun looks to be missing the handguard.
Looks like what's left of a Czech VZ52. Not much else has that folding bayonet. Most likely in the original 7.62x45 cartrdige. Century did import some of them about 20 years back.