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Keuffel & Esser “020” Pentel Graph Pencil 58 0403

Keuffel & Esser Co., New York City

lead diameter(s) mechanism composition variations production date origin	0.020 inches (0.5 mm) pushbutton incremental advance plastic barrel, metal fittings none early 1970s Japan
see also	Keuffel & Esser "020" Leroy Pencil Pentel Graph Pencil

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Keuffel & Esser 58 0431

Keuffel & Esser Co., New York City

lead diameter(s) mechanism composition variations production date origin	0.5, 0.7 mm, ? pushbutton incremental advance plastic barrel, metal grip and fittings none circa 1970s Germany
special features	lead degree indicator
see also	Faber Castell TK 9715 T