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Pentel 350 E

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.5 mm pushbutton incremental advance clutch with fixed sleeve plastic barrel, metal components unknown (1960s) Japan
see also	pentel 9500

I am unsure where this pencil fits in history of micro-lead pencils, but it must be fairly early. Notice the thin pushbutton. Only a single column of lead can be stored in the lead tube unlike virtually other every micro-thin pencil I am aware of which all have a repository for a dozen or so extra leads. See also the model 9500 below. I am not sure which of these two models predates the other, but they appear to be identical.

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Pentel 9500

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.5 mm pushbutton incremental advance clutch with fixed sleeve plastic barrel, metal components unknown (1960s) Japan
see also	Pentel 350 E

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Pentel Sharp 9 PS-100

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.9 mm pushbutton incremental advance clutch plastic barrel, metal mechanism barrel color: brown, blue, ? (early 1970s) Japan

The two examples immediately above have the imprint molded into the barrel and are probably slightly later than the stamped imprint type above.

Technically, this model is not a drafting pencil (it has no lead sleeve) and was probably not marketed as such although the long barrel is unusual for a non-drafting model.