Got this back from my dad, it is running a little fast so I volunteer to fix it when I get back to Singapore tonight (send it to the watch man I mean)
The missus is at Easter Service and my old heathen ass is celebrating the day by grubbing around in the garden wearing an old soft shirt and an old watch...
It's a Eulit Kristall - https://www.watchgecko.com/eulit-kristall-genuine-perlon-watch-strap.php Very comfy and lightweight.