Casio G-Shock MR-G Hammer Tone is truly a tool watch, it is a limited edition watch which created to celebrate the 20th anniversary of MR-G. 
The Hammer Tone is one of those mash-ups of pop culture and tradition that seems so highly characteristic of Japanese culture. The Hammer Tone is a G-Shock through and through, of course – it’s water resistant (200 m), shock resistant (naturally), and has a plethora of features, including a GPS receiver to update time at any of 40 time zones around the world . But what gives it its name – and price – is that it’s decorated with the technique known as tsuiki, in which a pattern is created on a metal surface through hammering.
One of the most notable uses of tsuiki was in the making of traditional Japanese arms and armor, and the related technique of tsuchime-ji can often be seen on the tsuba, or hand-guards, of Japanese swords. The case and bracelet are DLC-coated titanium, but the hammered bezel and center links are finished with oborogin (“dusky silver”) a silver and copper alloy (the word is derived from oborozuki, which means “the hazy brightness of the moon on a spring night”). Oborozuki is an older, alternate term for a group of such alloys which were traditionally used on Japanese sword fittings, and which were collectively known as shibuichi, or “four parts to one,” for the ratio of silver to copper. Other elements including the crown and bezel screws have been ion plated in akagane. An example of a tsuba with hammered decorative finish, in the collection of the Museum of Fine Arts in Boston, can be seen here; the Hammer Tone was designed in collaboration with third-generation master metalworker Bihou Asano, who has created hammered metal statues of deities, as well as incense burners, for the Kyoto State Guest House.
This will be a limited edition of 300 pieces. The Hammer Tone is a weirdly fascinating object. It’s functionally everything you could possibly want in a G-Shock, and in a modern multifunction quartz watch, but it’s also a design object and cultural artifact with a very specific kind of appeal.
