Just got this incredible condition CFX-200 scientific watch on eBay for 75 dollars + shipping and put a nato strap on in. So glad to finally get one and call it my
CASIO (197) CFX-200 SCIENTIFIC CALCULATOR DIGITAL WATCH FOR PARTS & REPAIRS# | eBay
Buy Casio CD-401 Calculator Watch Module 246 Vintage Nerd Data Online in India - Etsy