<	Thin Lead Drafting Leadholder Thumbnail Index	direct link http://www.leadholder.com/lh-thin-pentel-psd.html#psd5	^ top

retractable point

Pentel PSD5

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.5 mm pushbutton incremental advance clutch, 4 mm fixed sleeve, retractable point plastic barrel, metal mechanism, nosepiece, and grip grip color: black, silver circa 1980s Japan
special features	lead degree indicator, retractable point
see also	Pentel catalog, 1980, p 21 US patent 3,713,745 "Push-Type Mechanical Pencil" retractable Pilot

<	Thin Lead Drafting Leadholder Thumbnail Index	direct link http://www.leadholder.com/lh-thin-pentel-psd.html#mechanica	^ top

0.3 mm model pictured	courtesy Pawel Bartuzi collection

Mechanica

Pentel, Japan

lead diameter(s) mechanism composition variations production date origin	0.3 and 0.5 mm pushbutton incremental advance clutch plastic barrel, metal grip and mechanics Japanese and export models 1968 to (1980s) Japan
special features	integrated retractable point protector, movable lead degree indicator
see also	British patent 1,273,716 "Mechanical Pencil"