They are nice derailleurs and the forerunner of Deore, but I am not certain they are valuable. This one says it is for a Halfstep gearing so that may garner some interest.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk