Shimano 600 front derailleur

Shimano 600 front derailleur FD-6100 600 Uniglid. The first generation(s) of Shimano 600 parts.  Like the Dura-Ace group it came from some fairly humble beginnings appearing to be only a small step up from the recreational use components that Shimano was producing at the time. By the early 1980’s, parts took on the 6100 series model numbers and the “Shimano 600 Series” name.