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may have begun life as a PX-10E of MCMLXXIII
the manufacturer went back to this lug pattern for one year at this time
the Juy dropouts are another clue
note the "blister" at the rear of the axle slot
this was the first year for this
it later received a threaded hole to accommodate an adjusting screw
one simple check which could be made would be to see if the person who performed the reworking retained the wood plug at the south end of the steerer
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