• That's a Mavic pista hub. Great find.

    sory, first time with flickr :O

    I would say it's a conversion, unless it was a prototype as I don't think Shimano offered stock threadless headsets back then. Reason I'm saying this is that Shimano themselves say in their tech doc/site (can't remember which) to buy the M Part coverter separately for threadless conversion.

    What kind of headset is this?

    It's Dura Ace and it's threadless. The internet seemed to suggest there was technically no such thing and that there were only 7410 threaded headsets which were converted. Apart from this sale thread which suggests it's super rare wow.

    http://www.bicyclebuysell.com/item/202418/vintage-dura-ace-7700-headset-1inch-ahead-threadless

    Is this one of them, or were there actually threadless DA headsets? Mine looks exactly the same as the one in the photo which suggests they weren't just home machined - or that they were done by the same person.

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