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Thank you for posting!

Do not think it could be later than 1968.

"JS" appears to be fond of oil lubrication for track hubs.

Do you know the meaning of the letter A on the hub barrel transfers?

Curious that a road model headset was used in the assembly - perhaps what was available...

Nominally at least, we appear to have a bar with a 26.4mm centre fitted to a stem with a 26.0mm clamp.

Note absence of lockring for cog. Perhaps just put together for photo op...

...wondering if origin might be latin america...

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verily, we should all benefit by a visit from Detective Chief Inspector MauriceMoss

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