Super Rare Casio F-15 Blue/Red model 1988, the brother to the white model, equally as rare, this is 1 of only two I've ever seen and is used but in great condition. :
Casio F-15 White Module 350 Refurbished Digital LCD watch | WatchCharts
Casio F-15 & W-18 : r/digitalwatches
File:Casio F-91 Module 593 Displaying CASIo.jpg - Wikipedia
Casio F-15 White model 1988 again a super rare Casio all original only ever seen 2 others for sale in the last 2 years, they command big money now! : r/ casio
Herren Uhr, Casio 350 F-15, 34 mm | Kaufen auf Ricardo