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the combination of this seat stay treatment and this pattern of Prugnat lug is suggestive of a possible Holdsworthy origin
may not have been done by Holdsworthy itself but perhaps by someone who had worked there
the drilled seat stay bridge appears original, would assume crown to be drilled as well, is that correct?
am thinking the intended application may have been training or path rather than actual track
the "62" marking in serial could easily be a date, fits right in with evidence of metal
a better view of crown might advance in the inquiry
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