A follow-up to my earlier post, I have now received this leather saddle with copper rivets. Tools also supplied for adjustment.
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And a view of the underside
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Price delivered is around £22 (well packaged and undamaged) , ordered from a local company called Lazada. Also available from Aliexpress, but I think you get stung with customs charges for UK delivery, but not so for here in Thailand. Initial impressions are positive. Will fit to one of my bikes for some test rides, and report back if any issues.