Note: "The dial of this 1924/5 hermetic tropical watch has the retailer's name, KENTS, on the dial. The movement and caseback are signed Rolex. Though there was, at the time, a Kent company in the U.K., Canada also had a jewelery shop that evolved from Kent Bros. to Kents during the 1850s through to the early 1950s. I've located a source for the shop - Eleanor Kent who says 'My grandfather owned Kents' Limited jewelry store in Toronto - had been a family business since the mid-1800s until my grandfather closed it down in the early Fifties (claimed the "new credit jewelers" had ruined the business!)'
Apparently, at one time "Kents" looked down their noses at Birks (of Canada), who didn't, at the time, offer high-end jewelry.
With this "tropical" or hermetic watch, you need to unscrew and remove the bezel before you can lift the inner watchworks and access the winding crown.
The advertisement shows Kents with Rolex brand watches (though not the tropical) in stock.
More info on these watches available on Page. 46 of "The Best Of Times, 3rd Edition". - R