|Other number||4||On one of the pieces.|
|Other number||5||On one of the pieces.|
Dimensionsoverall: 1/4 in x 2 in x 3 3/4 in
DescriptionThe object consists of two pieces.
Per Jack Ward, Transistor Museum -
"Unknown Black Molded Plastic Experimental Semiconductors (2 pieces). Early to mid-1950s. These two devices are not yet identified. The construction appears to be experimental roughly molded plastic. These are no labels or other type of identification. One device has four leads and the other has five. It is possible that these are multiple diode structures, but further electrical measurements would be required to confirm the actual semiconductor structure of these unique devices. Extremely rare – the manufacturer or structure of these devices is not currently known. A preliminary assessment suggests that these devices are experimental units, and possibly multiple diode structures. These are the only known examples."