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Rotring, although famous for their thin lead mechanical pencils and before that, technical pens, has had a few models of 2 mm leadholders.   In addition to those shown below, those that are part of a series which includes thin lead pencils are on separate pages:

rotring 300

rotring 500

rotring 2.0 mm compass insert

rotring 1305

rotring 1305

rotring, Germany

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch with fall-stop
molded plastic barrel, metal clutch
none
circa 1970
Germany
   
special features movable lead degree indicator,
fall-stop feature
see also US patent 3,523,741
rotring 1310

rotring 1310

rotring, Germany

lead diameter
mechanism
composition
variations
production date
origin
2 mm
pushbutton spring clutch
molded plastic barrel, metal clutch
none
circa 1970
Germany
   
special features movable degree indicator

rotring PS2

rotring, Germany

lead diameter
mechanism
composition
variations

production date
origin
2 mm
pushbutton spring clutch
molded plastic barrel, metal clutch
colored barrel: green, orange, red, yellow, ?
degree imprint: H, (full range unknown)
(1990s)
Germany
   
see also model 505 in rotring catalog, c 1990s, p 97