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Pentel Sliding Sleeve Sharp PS523

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.3 mm pushbutton incremental advance clutch with sliding sleeve plastic barrel, metal components unknown circa 1980 to (present) Japan
see also	Pentel catalog, 1980, p 25 Pentel Sharp Pentel Sharp for Film

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Pentel Sliding Sleeve Sharp PS315

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.5 mm pushbutton incremental advance clutch with sliding sleeve plastic barrel, metal components barrel color: blue, gray, ? circa 1980 to (present) Japan
see also	Art Brown catalog, 1978, p 100 Pentel catalog, 1980, p 25 Pentel Sharp Pentel Sharp for Film