A Decimal Repeater works like any minute repeater, chiming the time on demand with two hammers, but instead of quarter hours it sounds the number of ten-minute intervals past the last hour, then the leftover minutes. At 7:37 it strikes seven low tones for the hours, three double-note sequences for the thirty minutes, then seven high tones for the remaining minutes. Mechanically, the quarter snail is replaced by a tens-of-minutes snail with six steps for zero to five, while the minute snail encodes zero to nine. The payoff is a more intuitive read: you convert the chimes straight into digits without the quarter-hour arithmetic a conventional repeater forces on your ear.
The modern decimal repeater is largely Kari Voutilainen's doing. He built the first one, the Masterpiece 6, around 2005, then the purer Masterpiece 8 in 2007, reworking refinished vintage LeCoultre ebauches from quarter striking to decimal striking. He never serialized them, making perhaps a couple of dozen, each unique; Phillips Perpetual recently listed a one-off decimal repeater GMT around $457,000. Seiko's Credor Spring Drive Minute Repeater is also a decimal repeater, with hand-hammered steel gongs by the Myochin family of Himeji, only a handful built a year, reference GBLS998 near $400,000. A. Lange & Sohne's Zeitwerk Minute Repeater pairs decimal striking with the jumping digital display, platinum ref. 147.025 from 2015 launched around 440,000 euros, with white gold (2020) and Honeygold (2023, near 449,000 euros) editions following.
This is the far corner of collecting, so the audience is narrow: experienced buyers, often already repeater owners, who care as much about the logic of the mechanism as the musicality of the sound. Listen first, judging the gongs for tone, sustain and clean separation between registers, then judge how well the chime maps to the display, whether digital or regulator. The honest trade-off is liquidity: decimal layouts read more naturally by voice, yet they resell more slowly than classic quarter-striking repeaters because so few buyers recognize them. Service also demands a watchmaker with genuine repeater experience, not a generalist.
Think of the decimal repeater as a niche within a niche. The Voutilainen pieces are warm, handmade and singular; the Credor fuses Japanese craft with Spring Drive's quiet precision; the Lange aligns decimal logic with a Zeitwerk dial that already looks decimal. All three are interpretations of one idea, and which is right for you comes down to the read you prefer, the voice you like, and the philosophy you want on your wrist.