RockWatch

The RockWatch or Rock Watch was a trademarked brand[1] of wristwatch by Tissot with a case essentially made of stone, initially alpine granite from the Grisons, Ticino, and Valais cantons of Switzerland.

It was designed by Robert Mazlo and first introduced to the U.S. market in December 1985 and in Switzerland March 1986.Tissot claims it was the world's first wristwatch with a case made of natural stone.

The final batches were fitted with a slightly redesigned embossed plate with a modernized T-logo and "rockwatch" in lower case letters (see Fig.5).

The original stone design was followed up by a similar watch with mother-of-pearl cases commonly nicknamed PearlWatch, while the backplates continued to carry the RockWatch name.

[5] Giant clocks sculpted authentically after the watch case by contract artist Felice Bottinelli could be seen in jewellers' shop windows all over Switzerland, adding to the recognition of this product.