Steadtler Lead Holder Series.
Mars 1002 (2nd generation) J.S. Staedtler, Nürnberg, Bavaria lead diameter mechanism composition variations production date origin 2 mm (slightly thicker for softer leads) twist lock clutch wooden barrel, metal clutch, ivory endcap 17 degree imprints: ... 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H ... (precise range unknown) 1924 to 1934 Bavaria Mars Lumograph 1018 J.S. Staedtler, Nürnberg, Ger..
2009. 1. 25.
Steadtler Micrograph Series.
Staedtler Mars-Micrograph Staedtler, Germany lead diameter(s) mechanism composition variations production date origin 0.5 mm, 0.7 mm, and 0.9 mm pushbutton auto advance clutch with fixed sleeve plastic barrel, metal mechanism none 1970s Germany Staedtler Mars Micrograph F 77013, 5, 7, 9 Staedtler, Germany lead diameter(s) mechanism composition variations production date origin 0.3 mm, 0.5 mm, 0...
2009. 1. 25.