Fourwatches.

My collection: three automatics and a quartz, from Geneva, Schaffhausen, Biel and La Chaux-de-Fonds.

London--:--:--

4Swiss watches, all in steel

70 hlongest power reserve, the GMT-Master II

200 mdeepest rating, the Formula 1

1 of 1,000the IWC Edition "150 Years"

Side by side.

Case diameters drawn to the same scale, then how long each one keeps running off the wrist.

Take a watch off at 6pm on Friday and pick it up at 8am on Monday: 62 hours. Bars show each movement's rated power reserve.

The TAG Heuer is quartz, so it runs on its battery for years and never needs winding.