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I picked up one of these NOS Tissot ‘rally’ bands to stick on a skin diver, recommended seller and price.
https://www.ebay.co.uk/itm/124517701936
https://www.ebay.co.uk/itm/124517701936
I didn't even know I wanted one until ten minutes ago.
I found it took a bit of trial and error bending before it sat right on my thin but flat wrist.