This 45-degree prism viewfinder for the Rollei SL66 has a feature that no other prism finder has: a 360-degree rotating base, so you can view from the back of the camera- like most finders- but also from the front or from either side, just by spinning the prism around. It’s a pretty excellent option to have if you are shooting in slightly unusual situations. Excellent cosmetic condition, with only light wear; the prism has very slight delamination, which is visible in the viewfinder but does not affect function.