Casio BM100 - 1989 - It was the first watch to have a triple sensor inside capable of measuring pressure, altitude and depth. Definitely cool 😎 : r/ casio
NOS CASIO BM-100 [560] DEPTH BAROMETER ALTIMETER SENSOR WATCH JAPAN BRAND NEW | WatchCharts
FS: rare Casio BM-100WJ in EU 60 - myWatchMart
Jual Jam Tangan Casio Vintage BM-100WJ Indonesia|Shopee Indonesia