Based on the
link ETA Thermoline 988.352, the B75 was a thermo-compensated high accuracy quartz movement that was capable of keeping time to +/- 10 seconds
link a year. These watches started to hit the market around 2001 and though they represent one of the more costly options in the lineage that is laid out above (not counting gold models), they offer the most advanced execution of an Aerospace to date, and if
link you care deeply for accuracy this is the reference to look for.