Japanese consumer-electronics manufacturer Casio was founded by Kashio Tadao in 1946 as Kashio Seisakujo. The then-struggling Tokyo sub-contractor initially produced microscope parts, but the arrival of one of Kashio’s younger brothers, Toshio, brought a new spark of inventiveness to the start-up. Its most famous early product was born of the scarcity of cigarettes following World War II. This was the yubiwa pipe, which was basically a finger ring with a mouthpiece that allowed smokers to puff away for longer than if they had to hold the burning cigarette between their unprotected fingers.

The yubiwa pipe was a big hit in postwar Japan, and profits from the device funded the company’s foray into calculators in the 1950s and ’60s. But it wasn’t until 1974 that Casio would enter the wristwatch market. Its debut product was a digital chronometer called the CASIOTRON, which displayed hours, minutes, and seconds on an LCD screen. Improvements to the display followed in 1978, and in 1982 Casio even released an analog wristwatch, the AQ-500. But its biggest splash in wristwatches came in 1983, when the G-SHOCK hit the market.

Distributed for its first few years mostly in the United States, where the bigger and bulkier wristwatch was accepted almost immediately, the G-SHOCK bucked the trend toward thin timepieces. In fact, in 1985, Casio released its own super-thin wristwatch, the PELA, which was 3.9mm thick, weighed a mere 12 grams, and was molded in one piece, watchband and all. But today, it’s the sporty G-SHOCK that people remember. For Casio collectors, some of the most sought-after G-SHOCK wristwatches are the Frogman and models designed by Dee and Rickey, who put their Lego-inspired, hip-hop-infused stamp on the phat timepiece.

Best of the Web (“Hall of Fame”)

National Watch and Clock Museum

National Watch and Clock Museum

This virtual museum, created by the National Association of Watch and Clock Collectors, lets you stroll through tim… [read review or visit site]

Clubs & Associations

Discussion Forums

Other Great Reference Sites

Most watched eBay auctions    

Casio Game 10 (gm-10) Digital Watch Module 165 VintageCasio Men's G Shock Mudman Watch G-9000 Alarm Chronograph World Time Black StrapCasio G-shock Gw9400-1 Rangeman Military Black Triple Sensor Atomic WatchWatches Joblot Digital Led Lcd Vintage Retro 70's Seiko Buler Zetron Logic CasioCasio Digital Watch A-201 Module 103 Blue Thunder Vintage Rare Casio G-shock Men's Aw-591ms-3aer : Black Orange Nylon StrapCasio G Shock RangemanCasio Edifice Red Bull Racing Infiniti Efr-534rb Mens WatchCasio G-shock Riseman Gw-9200jCasio Men's G Shock G-100 Watch Analogue & Digital Displays Black Rubber Strap Used Casio Men's Gwn1000b-1b G-shock Master Of G Gulfmaster WatchCasio Mens G-shock Twin Sensor Neon-illuminator Watch Rrp £260Casio G-shock Heathered Grey Dial Resin Men's Watch Ga110ht-8a $160Casio Eqb-510rbm-1aer Mens Edifice Red Bull Racing Ltd Ed Solar Watch Rrp £550Casio Edifice Chronograph Well UsedVintage Casio Digital Wr 200m Alarm Chrono G Shock G-shock 240 Dw-5200 Dw 5200 Pro Trek Solar By Casio Prw-3000Casio G Shock RangemanCasio Prg-280-1er Mens Pro Trek Twin Sensor Watch Rrp £200Casio G Shock 2759 With Black Metal Bracelet. Very Rare!Casio Casiotron Digital Watch Computerized 1970s Classic Working Example Lcd LedCasiotron 04-506 Vintage Lcd Digital Casio Quartz Lc 1970sCasio G Shock Mudman Black Gw9300-1 Tough Solar Twin SensorJob Lot 13 Vintage Casio Quartz Wrist Watches Spares & Repairs Digital + AnalogCasio Mudman G-9000 G9000Casio G-shock Gw500a-1v 2688, Tough Solar, Atomic Radio Wave Ceptor, Men's WatchCasio G-shock Watch - Dw-5000c-1a - 1983 - Hero - Mod 240 - Men's - Rare Casio Edifice WatchCasio G Shock 1647 'glide' Watch. Very Rare!Casio G-shock Dw-6600b ''g'' Quartz Men WatchCasio Eqw-t1010rb-2aer Mens Edifice Black Steel Bracelet Watch Rrp £550Casio Cmd-40b Vintage Lcd Tv Remote Control Digital Watch Works Nos All BlackCasio G-shock Men's Analog-digital Xl Gray Resin Strap Watch Ga110ts-8a2 $120Casio G-shock G-7900a Wrist Watch For Men Rescue RedCasio Edifice Ef-558 Mens WatchRare!! Vintage Casio G-shock Dw-5600 Jelly Frame Watch Works GreatJapan Casio G-shock Multi-band 6 Gw-m5610bc-1jf Black Color Ems SpeedpostCasio Gr-8900a-7er Mens G-shock World Time White Solar Powered Watch Rrp £120Casio G Shock Mens Black Resin Blue Accent Analog Digital Watch Ga110cb-1a $130Casio G Shock Awg 101 Solar WatchCasio Ga-100cf-1a9er Mens G-shock Black Chronograph Watch Rrp £110Casio G-shock Glx-5600a-3er Casio G Shock 2958. Very Rare!Casio Edifice Ef-539 Mens WatchCasio Prw-3000-1er Mens Pro Trek Triple Sensor Mount Rolleston Watch Rrp £250Casio Gwa1000-1a G Shock Watch For MenCasio Gd-x6900gd-9er Mens G-shock Rose Gold Resin Strap Combi Watch Rrp £110Casio G-shock Gw-3500bCasio Efr-534d-1a2vef Mens Edifice Silver Steel Bracelet Watch Rrp £150Casio G Shock Dw-6900 Nr!!!Casio Dw 6900 G Shock Men's Black Digital Watch #5623Casio Efr-550d-1avuef Mens Edifice Silver Steel Bracelet Watch Rrp £190Rare Casio G-shock Dw-6600 Military Issued Australian Special ForcesCasio G100-1b Men's G-shock Ana-digi Dual Time Black Resin WatchMens Casio Mudman G 9000mx Copper Grey G Shock 3031 Thailand Y ModuleCasio G-shock G-d100 Men's WatchCasio G-shock 1289 Black Maroon Band Shock Resistant WristwatchVintage Casio Calculator Japan 1982 Vintage Watch Parts Project Lcd Alarm ChronoCasio Digital Watch Cd-401 Module 246 Casio G Shock Gw-5000-1jf Multi Band 6 Japan Made