Hi Nick. There is one is for sale on Ebay:
https://www.ebay.com/itm/201746598589Purchases made through these links may earn this site a commission from the eBay Partner Network
Which based on caliper seems to be about 31mm. Based on the fact that dial only comes in 36 and 39 mm models (XXL dial has sub seconds on the bottom) the one you are showing should be for the 36 mm model. I think the dial is genuine.
Regards,
Francisco
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