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Ohto SP 500 Series

SP-503M, SP-504M, SP-505M, SP-507M, SP-509M

Ohto, Japan

lead diameter(s) mechanism composition variations production date origin	0.3, 0.4, 0.5, 0.7, 0.9 mm incremental pushbutton advance all metal none known 2007 Japan
special features	rotating lead degree indicator

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Ohto Promecha 1000 Series

OP 1003, OP 1004, OP 1005, OP 1007, OP 1009

Mitsubishi, Japan

lead diameters mechanism composition variations production date origin	0.3, 0.4, 0.5, 0.7, 0.9 mm incremental pushbutton advance all metal with soft plastic grip none known 2007 Japan