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5 s/year :
Citizen Chronomaster "The Citizen" : classical design with perpetual calendar. Caliber A660. 32768 Hz quartz, thermocompensated
< To my mind, though, it's distilled essence of watch. A pure, classic design. Very focused on functionality. Not out to impress. Not trendy. Nothing there that doesn't need to be there. And, perhaps paradoxically, very elegant to me because of this.> Bruce Reding
10 s/year :
Citizen "The Exceed" : classical design.
Longines Flagship VHP : classical design with perpetual calendar. Caliber L546 (ETA Thermoline movement 252.611). A very interesting WatchUSeek thread about this watch.
Piquot Meridien Octantis : Marine Chronometer certified by the Besançon National Observatory in France. Perpetual calendar. ETA Thermoline movement.
Seiko "Grand Seiko" : classical design. 32768 Hz thermocompensated quartz.
Seiko Dolce & Exceline : women and men assorted watches. Not all models of this line have the 10s/y accuracy.
15 s/year :
Breitling SuperQuartz : Aerospace, B-1, and Colt models. As far as I know, no official accuracy claim from Breitling, but their chinese representative gives an accuracy of 15 s/year. This value seems conservative, as these watches use an ETA Thermoline movement, which is said to be rated at +/-0.02 second per day (less than 10 s/year).
20 s/year :
Mühle Marine Chronometer : Desk marine chronometer actually built by Hanseatic Instruments. 4.19 Mhz quartz, temperature stabilized. Here is a picture of the test certificate which comes with the clock. The manufacturer claims an accuracy of 0.01 s/day (3.65 s/year), but my model loses 16 s/year (+/-1s). Nevertheless it could be adjusted without opening the case with an oscilloscope and a small screwdriver.
Omega Constellation Perpetual Calendar : thermocompensated quartz, caliber 1680 (ETA Thermoline movement 252.511).
Seiko Brightz Chronograph : Caliber 7J21.
Seiko Spirit : classical design with perpetual calendar. Models SBQLxxx & SBQKxxx. Caliber 8F32 & 8F33, 196 608 Hz quartz
Seiko Brightz SAGM007 & 009. classical design with perpetual calendar. Caliber 8F32.
Seiko Diver Scuba 200 m : diver watch with perpetual calendar, from Prospex line (Sport watches). Models SBCMxxx. Caliber 8F35, 196 608 Hz quartz.
Seiko Alpinist : perpetual calendar and 24 h hand, from Prospex line. Caliber 8F56, 196 608 Hz quartz.
25 s/year :
Kriëger Tidal Chronometer : 200 m water resistant watch which gives moon phases and tides. The manufacturer didn't give its accuracy but it is COSC certified.
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