This rare vintage Ihagee Exakta VX lens reversing magnifier viewfinder is for precision macro photography focusing. There are a couple of light scuffs on its exterior and on its mount. Please see photos.
Exakta
Exakta
Telisar
Carl Zeiss Jena
Tougodo Meisupii
F Deckel-Munchen
Staeble
Steinheil Munchen