| 1985 | ETA manufactures a movement for the Flatline series with the same technique, calibers ETA 255.511 and 255.561, 1.95 mm thick, developed in co-operation with Asulab and Longines. |
Quartz Watches with Micromotor and hands · No. 41
41. ETA 255.511 and 255.561
The only Swiss wristwatch with two quartz crystals.