Longines L888.5 (ETA A31.L01 base)

Longines' three-hand automatic caliber with silicon balance spring, based on the ETA A31.L01 exclusive architecture. At 4.9mm height it is slimmer than the L844.4 day-date variant, making it suitable for more elegant case profiles. The 72-hour power reserve ensures the watch keeps running through a weekend off the wrist, and the silicon hairspring provides antimagnetic properties up to 1,000 gauss.