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 G-shock AviatorCasio G -shock Gulfman In Blue G-9100 Very Nice Looking Watch Lcd Digital VgcSuperb Casio Pro Trek 3134 Unisex Digital Sports Wristwatch, Working - V03 D21 Casio Tc600 Vintage Retro Mens Digital Vintage Touch Sensor Watch Lcd Led JapanCasio G-shock Ga-100-1a1 Wrist Watch For MenMens Casio G Shock Gwa1100 1a3 Aviation Tough Solar World Time WatchCasio G-shock Mudman Gw-9300rd-4er "men In Rescue Red" Limited Edition BnibCasio G-shock Gw-3500b-1aer WatchMen Casio G Shock Resistant Watch 5158 G-100 Water 20 Bar Dive Black ResinCasio G Shock Mudman G-9000 Used Dw-5000 C-1a First Casio G-shock 1983 Vintage Original Module 240 Japan BMens Casio G Shock Awgm100b 1a Solar Stealth Black Digital Analog WatchCasio G Shock Gd-110 Blue Great Condition Comes With Box And Tin Mens Casio G Shock Ga1000 8aer Gravity Defier Twin Sensor Black Grey WatchCasio G Shock Ga100c 8a Analog Digital Shock Resist Dark Grey Resin WatchJoblot Seiko Ana-digi Citizen Traser Casio G Shock Digital And AnalogueGents Casio Pro Trek Prg-40 Triple Sensor Compass Barometer AltimeterMens Casio G Shock Ga1000 1a Gravity Defier Twin Sensor Black Digital WatchCasio Men's G-shock Radio Waveceptor Black Chronograph Watch Awg-m100a-1aerClassic Casio G-shock Gulfman Rust Resistant Gw-9110 Titanium Back Rare Casio G-shock Mr-g 220 Stainless Steel Watch Japan Free Int ShipingCasio G-shock Gw-5000-1jf Multi Band 6 Watch Japan With Extra StrapCasio Men's Pag240t-7cr "pathfinder" Triplesensor Multi-function Titanium WatchCasio Divers Watch 100m JapanUsed Casio Pro-trek Prw2500t-7 Triple Sensor Titanium Solar Atomic Watch AtomicRare Casio G-shock G-540d 4314 Gold Bezel In Superb ConditionCasio Men's Pag240t-7cr "pathfinder" Triplesensor Multi-function Titanium WatchG-shock Frogman Dw-9900 1djf Blue Limited Titanium Casio Watch (8200 8201 8250Used Casio Mens Pag240t-7 Pathfinder Triple Sensor Multi-function Titanium WatchCasio G-shock Frogman Dw-9900 Blue Limited Titanium Casio WatchCasio G-shock Military (ga100sd-8a) Wrist Watch For Men'sCasio G-shock Mtg Tough Solar Atomic Watch 2870 Mtg-930duCasio Baby G-shock Baby-g Bg-114 Dark Blue Silver Pink Women Nice!! Euc!!Casio Efm100-1av Edifice Marine Mens Black Day/date Dial Blue Bezel WatchCasio Men's Pag240t-7cr "pathfinder" Triplesensor Multi-function Titanium WatchCasio Pro Trek 5415G-shock Custom Frogman Bezel & Band Gf-8250k-4jr Pink Module 8200 Casio WatchCasio G-shock Ga-100-1a1 Wrist Watch For MenCasio G-shock Ga-110 Men's Black Watch E4326Casio Men's Mtgm900da G-shock Stainless Steel Tough Solar Atomic Digital WatchCasio G Shock Perfection Digital Wrist Watch - Day/date - White BandCasio Pro Trek Pathfinder Black Tough Solar Wrist Watch - Prw2500-1cr Prw2500-1Casio G Shock Ga-100-1a2 Mens WatchCasio G-shock 5146 Ga-1138 30th Anniversary Mint Condition Men's Sports WatchCasio G Shock Trending Series Ga100c 8a Analog Digital Watch Grey/neon BlueCasio G-shock Dw-6600Casio Dw9052-1b Mens G-shock Digital Sports Watch 200m Stopwatch Multi AlarmCasio G-shock Ga1000-4a Men's Watch (orange/black)Men's Casio G-shock Xl Watch Ga-110gb Gold & BlackCasio G Shock G-shock Glx-150x-7er In4mation Limited Edition Special WatchCasio G-shock Riseman Gw-9200 Module 3147 For RepairCasio G-shock Gw-5600j Wave Ceptor Tough Solar Atomic Black WatchCasio G-shock Watch Mudman Gw-9010r Black And Rescue OrangeMen's Vintage Casio Tc-500 Digital Watch With Touch Screen,very Good,working.Casio Edifice Era-200db-1av Watch3 Casio G-shock Watches, 1 White, 2 Black (1 Solar). Very Nice LotMens Casio G Shock Ga 100 1a1dr Stealth Black Xl Analog Digital WatchThe King Casio Gx56 G Shock Mens Casio G-shock Mtg-900da Digital Watch Waveceptor Solar Atomic Alarm WatchCasio G-shock Sky Cockpit Red Urban Camouflage Series Watch - Ga100cm-4a