DT = DT (Switzerland) U = Union (Germany) R (backwards) = Redaelli (Italy) A = Alpina (Italy) Y = Prym (Germany) E = Trois Étoiles, translation 3 star, Robergel (France) crescent = Robergel (France) clover = Berg-Union (Switzerland) star = Stella (Italy)
Might be some mistakes above... contribute what you know...
Chuck Schmidt
South Pasadena, CA USA
http://www.velo-retro.com (reprints, t-shirts & timelines)