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  Dur-O-Lite/Dietzgen 3140 “Keen-Point” Drafting Pencil

Dur-O-Lite/Dietzgen 3140 “Keen-Point” Drafting Pencil

Eugene Dietzgen Co., Chicago

lead diameter(s)
mechanism
composition
variations
production date
origin
0.047 in. (1.2 mm)
continuous twist advance
wooden barrel metal mechanism
16 degree imprints: 5B–B, HB, F, H–9H
circa 1963
USA
   
see also US Patent 3,097,628 "Mechanical Pencil," 1963
Dur-O-Lite "Keen-Point" Brochure

box of one dozen Dietzgen branded Keen-Point pencils

reverse
  Dur-O-Lite "Film-King" Drafting Pencils

Dur-O-Lite “Film-King” Drafting Pencils

Dur-O-Lite, Melrose Park, Illinois, USA

lead diameter(s)
mechanism
composition
variations
production date
origin
1.2 mm
continuous twist advance
wooden barrel metal mechanism
4 degree imprints: D-O, D-1, D-2, D-3
circa 1963
USA
   
see also US Patent 3,097,628 "Mechanical Pencil," 1963
Dur-O-Lite "Film-King" Brochure