Nikon Safety Cover for Medical-Nikkor Lens

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Production year 1962/63
Type 1
Black plastic, marked «Nikon»
Since the camera body is at ground potential relative to the ringlight power supply voltages, the flash contact on the camera accssory shoe should not be touched and the accessory shoe safety cover should be fixed in place.
Matches Medical Nikkor 200mm f/5.6 lenses No.104027, No.104030, No.104464