De Ville is about as far from chronographs and dive scales as Omega gets, and the Mini Trésor pushes further still — a 26mm case built around a quartz manufacture movement, not automatic, which tells you precision and slimness were the brief, not power reserve or complication count. Ref. 42817266004004 carries a Grand Feu enamel dial, a technique that's genuinely rare at this level of the market and worth more attention than a plain white dial gets on first glance. Water resistance is a modest 30m, which is correct for a piece that's never leaving the wrist for anything more strenuous than dinner. It's a small, quiet watch that rewards close inspection over distance.