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 Mudman Millitary Green Watch G-9000-3vdr G-9000-3v Exdisplay Vgc Casio G-shock Ga-100b Red World Time Alarm Chrono All Operational Exdisplay Vgc Casio Edifice Red Bull F1 Watch Bnwt. Casio Edifice Watch Red Bull Racing Limited Edition Efa-131rbsp Vintage 80s Casio Dw-5200 [240] G-shock "hero" Lcd Digital Watch Original BezelCasio Edifice Red Bull Racing Era-200rb Mens WatchCasio Men's Gw 7900cd G-shock Rescue Yellow Digital Sport Watch UsedCasio G-shock Gwg-1000-1a3crCasio Edifice Red Bull Racing Efa-131rbsp Mens WatchCasio G-shock Mr-g Gps Hybrid Multiband Mrg-g1000b-1aCasio Pro Trek Prg550b-5 Camo-strap Triple Sensor Solar Analog-digital WatchCasio Era-300rb-1aer Mens Edifice Red Bull Racing Twin Sensor Watch Rrp £350Casio G-shock Gw9400-1 Rangeman Triple Sensor Solar G-shock Dw-9700ul-9t Yellow Gulfman Usla Limited Tide Titanium Casio Watch Mint Casio G-shock 5158 G-100 Watch ~ Black With Red AccentsGents Men Casio G Shock Wrist Watch Used Watch Condition 80%Casio Gwf-1000-1dr Mens G-shock Premium Radio Controlled Solar Watch Rrp £500Casio G -shock Black Very Nice Looking Ana/ Digital 2 Boxes Books Good Uesd ConCasio Prg40b-2ver Pro Trek Triple Sensor Sports Mens Watch No ReserveCasio Gpw-1000-1ber Mens G-shock Solar Powered Black Mixed Strap Watch £750 RrpCasio Men's Prg550-1a1cr Pro Trek Triple Sensor Tough Solar Analog-digital WatchCasio G-shock X-large Black Analog Digital Military Sports Watch Ga110-1bVintage Casio Digital Lcd Cfx-20 197 Scientific Calculator WatchCasio G Shock~ga100-1a1~black Ops~stainless Steel~unisex Mens Ladies Watch~$99Casio G-shock Gdx6900lg-8 Ice White Watch, Mint, Full KitG-shock Dw-9500sr-2t Blue Surfrider Foundation Thermometer Casio Watch MintCasio Pro Trek Tough Solar Triple Sensor Atomic Mens Watch Prw2500r-1crCasio Eqw-m1100db-1aer Mens Edifice Waveceptor Steel Solar Powered Watch £299 RpCasio G Shock Gulfman G9100 Moon Tide Rust Resist Watch Casio G-shock Gd-120cm-5 Gd-120cm 12/24-hour Timekeeping WatchCasio G Shock Watch Gr-8900a Casio G Shock WatchCasio Waveceptor Illuminator World Time Alarm Chrono Radio Controled ExdisplayCasio Wave Ceptor,radio Controlled Chronograph Watch With Box And PapersRare All Original Huge Casio Edifice Men's Chronograph Diver Ss Watch NrCasio G-shock X Sneaker Freaker 'nightowl' Dw-6900 WatchCasio G Shock Sneaker Freaker Collab Nightowl Dw6900fs Limited Edition RareCasio G-shock Gx-56-1bdr WatchCasio Mens Watch G-shock Tough Solar World Time Black/red Gx-56Casio G-shock Dw-8400g-1 MudmanVintage Working Casio C-701 Quartz Digital Mens Calculator Watch Stainless Casio G-shock Gw-5000-1jf International WarrantyCasio Ga-110c-7a Men G Shock Water Resistant White Strap Watch Ga-110c-7adrLot Of 2 Older Quartz Watches Casio C-801 And Pulsar Digi Analog Vintage Casio G -shock Dw-003 G-lide 200m Rare Very Nice Looking Good Uesd ConCasio G-shock Rangeman Gw-9400-3 Military Olive Green WatchCasio G Shock Watch Ga110hc-1aBaby-g G-shock Casio Gwx8900b-7wb White Watch - Proceeds Benefit Animal ShelterCasio G Shock Watch - G7700-1er2 Men's Casio G-shock Tough Solar/wavecepter Sports Watches As-is,Casio G Shock Mtgm900da Tough Solar Digital Watch Alarm Wave Ceptor Atomic Vintage Digital Casio Mens Retro Watch Alarm Chronograph 415/a151 WorkingCasio Ga-110ts-8a2er Mens G-shock World Time Grey Resin Strap Watch £130 RrpCasio Sport Sea-pathfinder Pro Trek Spf-70ts 2825 Triple Sensor Tough Solar HugeCasio Mens G-shock Bluetooth Alarm Chronograph Watch £160 Retail PriceCasio G-shock Ga-100aCasio G-shock Gdx6900gd-9cr GoldCasio G-shock Multi-function Mens Wrist Watch | Model Ca-100Retro Casio Sea Pathfinder Spf 40 Digital Watch Great ConditionMen's Casio Wave Ceptor Wvq-550 Chronograph Watch Just Serviced Runs GreatCasio G- Shock Mudman G-9300-1 Tough Solar Wrist Watch