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The RockWatch or Rock Watch was a trademarked brand〔U.S. Trademark registration numbers 1453146, 1941265, 3213659, 4694037〕 of wristwatch with a case made of granite, introduced by Tissot in 1985. It was designed by Robert Mazlo. Tissot claims it was the world's first wristwatch with a case made of natural stone. When introduced in the U.S., it retailed for $195.〔K. Vikram, ''Directory of Dimensional Stones'', 1986, p. 85.〕 Over 500,000 were sold.〔''Industrial Diamond Review'' 47:186 ()〕 ==Notes== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RockWatch」の詳細全文を読む スポンサード リンク
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