Phil I think it was called a "pro-class" MX seat clamp on the goose mate - but yeah you're right it's basically a DiaCompe copy (not as good though
) as for the ebay listing i doubt it's a goose one but it looks quite nice. I've got a pro-class one that came off a cali - it's a survivor (if you can call it that) it's all pitted and needs work
In my opinion the goose ones are a bit chubby in comparison to the others knocking round