I recently purchased a BRNO rifle in 8X57 with a full length carbine (20.5" barrel)stock and a "butterknife" bolt handle which I gather is either a Model 21H or 22F. In any case, it has a safety which I am not sure is original with the rifle. It protrudes straight out to the left in the "fire" position, and straight up in the "safe" position. Does anyone have any experience with either of these models?

It is not the same as the safety on the ZG-47, which was made at roughly the same time. That safety works fore and aft like an early Sako safety.