MERLIN BLACK .
Manufacturer : United Optical Instruments Southend-On-Sea Engeland.
Dates : 1936
Cast Metal 20×20 mm subminiature camera .
Comes in Black ,Blue ,Green and Red crackle finish enamel.
No indentification on the camera ,except small name decal on some examples .
The same camera is used in the Erac Pistol camera .