Casio watch. Had it for ~20yrs. It died today but I just replaced the battery and it's back again! I had only changed batteries twice: 10 yrs ago and today. Truly BIFL
The G-Shock Watches with the Longest Battery Life (5-10 Years)
CASIO X-GIRL x G-SHOCK collaboration DW-5600 Battery-powered Used from japan | eBay