I've had it for years, but just dug it out as a possible shoe-mount for a recently acquired Contax IIa. It works, and seems pretty accurate in sunlight. A few things about it puzzle me. For example, there's a slot in the door that admits a little light even when the door is closed. This must be for metering in very bright light. But, it's not clear what on the dials, if anything, relates to this door-closed mode. A manual would help.
James