Clever thing, this small adapter. Lets you employ the use of regular flash units with Minox cameras.

flash adapter

This slide on metal adapter provides a mounting point and electrical contact for standard electronic flash units from other manufacturers. Although they will physically slide onto and work with all models of Minox 9.5mm cameras (excepting the EC/ECX series), owners of Model IIIS and earlier cameras may find that it obscures their view through the viewfinder. Longer model cameras won’t have this problem; a window cut out is built in so as not to obscure the exposure metres on the models that have one. Model III, II and Riga cameras do not have the electrical contacts necessary for a flash unit to function with them using this adapter.

(http://users.rcn.com/youngds/Minox/Accessories/accessories.html)