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 Edifice Twin Sensor Era-200 Mens WatchCasio Edifice Tough Solar Bluetooth Eqb-500 Mens WatchCasio G Shock Tough Solar Multi Band 6 World Time Chrono Wave Ceptor Alarm VgcCasio Edifice Ef-539 Mens WatchMens Casio Edifice Wave Ceptor Tough Solar Alarm Chronograph Wrist Watch Casio Edifice Bluetooth Tough Solar Eqb-500 Mens WatchCasio Edifice Ef-539 Mens WatchCasio G-shock Gw-m5610-1er Wave Ceptor Radio Controlled.Casio Edifice Wave Ceptor Tough Solar Eqw-m710 Mens WatchCasio Edifice Ecw-m300e Wave Ceptor Tough Solar Mens WatchCasio Edifice Efa-135 Mens WatchCasio Edifice Tough Solar Bluetooth Eqb-510 Mens WatchMens Casio Edifice Bluetooth Tough Solar Eqb 500 Stainless Steel Wrist Watch Casio Edifice Tough Solar Bluetooth Ecb-500 Mens WatchVintage Casio Ax-210 118 Lcd Melody Alarm Watch! Verygood!Casio Edifice Red Bull Racing Infiniti Era-300rb Mens WatchCasio Edifice Illuminator Efr-547 Mens WatchCasio Super Illuminator Divers Watch 200m 3304 Mtd-1054 20barCasio Edifice Wave Ceptor Tough Solar Ecw-m300e Mens WatchCasio Edifice Era-200 Twin Sensor Mens WatchCasio Era-300rb-1aer Mens Edifice Red Bull Racing Twin Sensor Watch Rrp £350Casio Dw 6600 Wristwatch G-shockMens Casio Edifice Bluetooth Tough Solar Ecb 500 Stainless Steel Wrist Watch Casio Gwm5610-1 G-shock Solar Watch With Nato Strap Adapter + StrapCasio G-shock Awg-m100-1aer Watch.Watch Lot Of 39 Casio Watches, Store Returns, Parts Or Repair G Shock, Digital, Mens Casio G-shock Red Detail Ana/digi Chronograph Watch Ga-100-1a4erCasio G-shock Ga110rd-4a Black/red Analog-digital Limited Edition Casio G-shock X-large Black Analog Digital Military Sports Watch Ga110-1bCasio Dw-5200 Hero G-shock Shock Resistant Watch Mod. 240 Very Rare 1984 JapanCasio Eqw-t620db-1aer Mens Edifice Radio Controlled Solar Powered Watch Rrp £300Casio G-shock Super Led With Vibration Alert WatchCasio Dw 6600 Wristwatch G-shockG-shock Baby-g Frogman Bgw-100 White Casio Watch RareCasio G-shock Gw9400-1 Rangeman Military Black Triple Sensor Atomic Watch Casio G-shock Gw9400-3 Rangeman Military Black Triple Sensor Atomic Watch Casio G-shock G-steel Tough Solar Stainless Steel Men's Watch Gsts110dCasio G-shock G-2500 Mens WatchCasio G-shock Mt-g S1000d 1a Tough Solar Multi Band 6Casio Gshock Gd 350 1ber Men's Watch.Casio Era-200rb-1aer Mens Edifice Red Bull Racing Twin Sensor Watch Rrp £300Casio Sgw1000-1a Men's Altimeter Braometer Compass Thermometer Sports WatchCasio G-shock Gw-7900rd Men's WatchCasio G-shock Mens Chronograph Alarm Black Red Watch Ga-100-1a4erCasio Sgw-100-1vef Mens Sports Gear Twin Sensor Watch.Casio J-100 Jogging Pace Runner Calculator Watch Mod. 183 Very Rare 1983 JapanCasio G-shock Watch Grey Camo Camouflage Analog Digital Ga-100cm-8aCasio Mens Edifice Radio Controlled Solar Powered Watch Rrp £450Nice!!! Casio 5246 G-shock Ga110ts Analog-digital Charcoal/orange Htf ColorwayMen's Casio G-shock Orange/gold/black Watch Used With BoxCasio Gpw-1000raf-1aer Mens G-shock Raf Aviator Black Resin Strap Watch Rrp £850Mens Casio G-shock G-rescue Red Digital Watch G-7900a-4erCasio-g-shock Men's Twisted Metal Mtg Series Watch-mtg S1000bdCasio G-shock Ga-110gd-9a Men's Tough Magnetic, Water Resistant Resin WatchCasio Men's Prg-270 Pro Trek Triple Sensor Multifunction Digital Sport WatchCasio Gd100-1b Men's G-shock World Timer Black Resin Digital Dial Dive WatchCasio G-shock Dw6900 Model Resin Men's Watch Black W Red Script ExcellentVintage Casio G-shock Dw-5600 Diver Watch 901 Lcd 200m Casio G2900f/8v Mens G-shock Watch With E-databank + 5 Multi Alarms Dark Grey【near Mint】casio G-shock Gwf-1000 Multi Band 6 (frogman 3184)