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Pentel 350 E
imprint reads: “PENTEL 350 E 0.5 mm made in Japan”
Pentel 350 D
imprint reads: “PENTEL 350 D 0.5 mm made in Japan”

Pentel 350 E & 350 D

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
   

I am unsure where this pencil fits in the history of micro-lead pencils, but it must be fairly early. It might be Pentel’s first pencil, does anyone know? Or maybe the Pentel Sharp 9 PS 100 is earlier. Fill me in if you know.

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 can think of which all have a repository for a dozen or so extra leads.