Model without rangefinder
The Kristall series of cameras are Leica copies, made in the 1950s by Domenico Chinaglia of Belluno in north-west Italy. The earliest cameras were made for sale by Guido Nomini of Milan, and are engraved with GN.M in a triangle on the rangefinder superstructure. Later cameras are engraved for Chinaglia, with CD in a rhombus as this one.
Reference :
http://camera-wiki.org/wiki/Kristall_(Chinaglia)