High Accuracy Timepieces

This is a list of model currently available only (2005). This list excludes GPS and radio-controlled watches, which cannot retain their accuracy in an autonomous way. Prices are from manufacturer (except for Mühle). Retail prices could be less. If not otherwise noted, accuracies are from manufacturer specifications. Thanks to Bruce Reding for informations and the way he shares his watch enthusiasm, and to Ppaulusz for informations about ETA movements.

5 s/year :
Citizen Chronomaster "The Citizen" : classical design with perpetual calendar. Caliber A660. 32768 Hz quartz, thermocompensated (?) 1 150 - 4 500 €

10 s/year :
Citizen "The Exceed" : classical design. 940 - 1 550 €
Longines Flagship VHP : classical design with perpetual calendar. Caliber L546 (ETA Thermoline movement 252.611).
Piquot Meridien Octantis : Marine Chronometer certified by the Besançon National Observatory in France. Perpetual calendar. ETA Thermoline movement. 1 185 - 1 738 €
Seiko "Grand Seiko" : classical design. 32768 Hz thermocompensated quartz. 1 150 - 3 700 €
Seiko Dolce & Exceline : women and men assorted watches. Not all models of this line have the 10s/y accuracy. 390 - 900 €

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. 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. 2000 €
Omega Constellation Perpetual Calendar : thermocompensated quartz, caliber 1680 (ETA Thermoline movement 252.511).
Seiko Brightz Chronograph : Caliber 7J21. 700 - 900 €
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. 600 - 780 €
Seiko Diver Scuba 200 m : diver watch with perpetual calendar, from Prospex line (Sport watches). Models SBCMxxx. Caliber 8F35, 196 608 Hz quartz. 200 - 230 €
Seiko Alpinist : perpetual calendar and 24 h hand, from Prospex line. Caliber 8F56, 196 608 Hz quartz. 300 - 350 €

based on article by Alexander Read (http://80calcs.web.ool.fr/Navigation/Astro/Chronometer.html)