TAG Heuer Aquaracer 300M Calibre 5 Ceramic 43 mm Larger Watch Swiss watches TAG Heuer by wholesalewatches - May 23, 20160 TAG Heuer unveiled the Aquaracer 300M line with two new references boasting a 43 mm case, 2 mm larger than the 41 mm models for lovers of larger watches, . Designed by TAG Heuer as the ideal timepiece for all kinds of extreme conditions, not just diving, the Aquaracer 300M