Some of the Interarms guns were like that and some were better polished.Early in my handgun days I briefly owned a interarms in 380. All I can recall about it is that the frame was had edges so sharp you could shave with it
It's funny that while the Interarms U.S. made guns were in production some of the serious Walther collectors bad mouthed them terribly -- now they've been discontinued and the attitude changed quite a bit.
I had a PPK/S in .380 and I remember it was all steel and kicked way out of proportion for the cartridge, very unpleasant to shoot.