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Have you discovered any markings on steerer?

W/B mount looks to be an add-on.

Suspect we are looking at the early seventies.

In photo, serial appears to read 10180. Is this correct?

Format & placement may prove a clue for the Brit-O-philes.

Like others, am suspecting possible JRJ product.

From appearance, would not assume yellow to be original finish. Looks as though it may represent a respray as well... But then U R the one on the scene!

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