Voigtlander Baby Bessa viewfinder

This is a magnetic mounted openframe viewfinder for the baby bessa.

My baby bessa had a broken viewfinder so ....seeing this one (http://www.thingiverse.com/thing:363857) I decided to do one for my camera !

You have two viewfinders :

It uses a magnet of 5mm diameter and 2mm depth for mounting on the bessa.

I haven't tested the accuracy with a film, but with ground glass it seems ok (be sure to align it correctly)!

PS : thanks a lot to schlem for the help !