Citizen Helmet Flyback ChronographCitizens Helmet chronograph ref. 8100 emerged at the peak of Japans mechanical ambition in the mid 1970s, when Citizen pushed to out engineer Swiss competitors through pure technical audacity. The iconic monobloc case, the source of the Helmet nickname, was a deliberate break from European design languagefuturistic, aggressive, and unmistakably industrial. Inside beats the in house cal. 8110, an advanced high beat automatic chronograph with flyback,