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I'm very underwhelmed by that selection, except for the Marathon. Let's hear it for Ralf Tech! Also, Gucci dive watches, which are made by Girard-Perregaux. £500 gets you a lot https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p2505460.m570.l1311&_nkw=gucci+dive+watch&_sacat=0 To me they are sort of the new Tag Heuer. I'm harking back to the '80s when all the public schoolboys in Fulham had a Golf GTi and a Tag Heuer 2000. I'd happily wear a Gucci if it only had weekday.
I'm with @Tenderloin
Like you said, same factory as Helson but a fake rolly... Meh... You pay hand over foot for a basic sea-gull movement.
https://youtu.be/d24KVT4SGqM