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Tombow Homo LC 8, obverse
Tombow Homo LC 8, reverse
  courtesy Andrey Gordenco collection

Tombow Homo LC 8

Tombow Pencil Co. Ltd., Japan

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch
all metal
unknown
unknown (pre-1970s)
Japan
   
Tombow Mono
Tombow Mono
reverse imprint: “Tombow Pencil Company Limited” gift from isu of The Uncomfortable ChairLink opens in new window.

Tombow Mono

Tombow Pencil Co. Ltd., Japan

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch
plastic barrel, metal fittings
none
1970s
Japan
   
 

Tombow unknown model

Tombow, Japan

lead diameter
mechanism
composition
variations
production date
origin
0.3 mm (0.5, 0.7)
pushbutton incremental advance
all metal
none
(1980s)
Japan
   
special features lead degree indicator
see also Uchida Sharp Drawing thin lead drafting pencil
This pencil shares a strange nose-heavy form with one from another Japanese maker, Uchida.

Tombow Monotech

Tombow, Japan

lead diameter
mechanism
composition
variations
production date
origin
0.3, (0.4), 0.5, 0.7, 0.9
pushbutton incremental advance clutch
plastic barrel, metal grip and mechanism
none
(circa 1990)
Japan
   
special features lead degree indicator in pushbutton
see also Tombow Monotech thin lead drafting pencil (dial type)
Tombow Monotech 2.0

Tombow Monotech 2.0

Tombow, Japan

lead diameter
mechanism
composition
variations

production date
origin
2 mm
pushbutton spring clutch
plastic barrel and indicator wheel, metal grip and mechanism
none known (dial color?)
grip color: black, silver
1990
USA
   
special features unique lead degree indicating wheel
see also US Design Patent 324,069 "Lead Holder," 1990
Tombow 2.0
I believe this variant without “Monotech” on the imprint was for the US market.

Tombow Monotech

(dial type)

Tombow, Japan

available lead diameters
mechanism
composition
variations
production date
origin
0.3, 0.5, 0.7, 0.9
pushbutton incremental advance clutch
plastic barrel and indicator wheel, metal grip and mechanism
accent tone: black, silver
circa 1990
Japan
   
special features unique lead degree indicating wheel
see also US Design Patent 324,069 "Lead Holder," 1990
Tombow Monotech thin lead drafting leadholder (without dial)
Tombow Monotech 0.5