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. :
15 16 17 18 mm Black Adjustable Survival Paracord Watch Band Casio Seiko Others | eBay
Casio Game Watch GR-15 Champion Racer Rare Vintage | eBay
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