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Smithian Drafting No. 633

(Smithian), USA (I think, sounds more like a British name though)

lead diameter
mechanism
composition
variations
production date
origin
OEM
2 mm
clutch
hard rubber barrel, metal components
colored ring at tail end:  red, blue, green, yellow, white, black
1950s
Germany
Fedra KG Rudolph Bauer & Co., Hamburg, Germany
   OEM: Fedra, Germany
see also Fedra 6020 drafting leadholder
Alvin 5020 series of drafting leadholders