judging from the overall condition I would say the fork is likely a replacement. can you post some closeups of the seat cluster and dropouts? is there anything stamped on the dropouts? any idea what the BB threading is?
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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