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Pentel Sharp 9 PS-100
stamped imprint reads: “PENTEL Sharp 9 (0.9 mm) PS-100 Japan”

Pentel Sharp 9 PS-100

(stamped imprint)

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
   
see also Pentel Sharp 9 PS-100 (molded imprint)
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. Could this be Pentel’s first mechanical pencil? Does any one know? Contact me if you have a theory.
Pentel Sharp 9 PS-100 molded imprint, brown
Pentel Sharp 9 PS-100 molded imprint blue
molded imprint reads: “PENTEL Sharp 9 (0.9 mm) PS-100 Japan”

Pentel Sharp 9 PS-100

(molded imprint)

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
   
see also Pentel Sharp PS-100 (stamped imprint)
The imprint is molded into the barrel on this version. This type probably slightly later than the stamped imprint type.