Not all images were able to load for printing. Please close the print window and try again. The PS Horology Tsuba 1720, Inspired by George Graham’s 18th-Century Watchmaking
With the Tsuba 1720, Peter Speake reinterprets a chapter of English horological history, inspired by a pocket watch George Graham made in 1719/20.
PS Horology is an independent Swiss watch brand founded in 2022 by Peter Speake, a watchmaker well-known to our readers. The Tsuba collection, an integrated-style sporty-chic watch named after the Japanese sword guard, was introduced in 2025 with the Tsuba Blue and Tsuba Dong Son, boasting a distinctive case design inspired by the symbolism of the quince fruit and the octagon in Japanese culture. For the Tsuba 1720, Peter Speake takes a look back at his country of origin and an important name in horology.
The Tsuba 1720 brings a new narrative to the collection and marks the first design collaboration between watchmaker Peter Speake and the brand’s Creative Director, Farhana Safa, bringing a historic dial design to the contemporary Tsuba collection. The inspiration is a pair-case pocket watch made by English watchmaker George Graham in 1719-20. Working from Fleet Street in London, Graham (1673–1751) was a partner and successor to Thomas Tompion, and one of the most important names of English watchmaking. The original watch features a gold champlevé dial, double chapter rings, black enamel Roman numerals and blued-steel beetle-and-poker hands. These details inspired the Tsuba 1720, though the new watch does not attempt to reproduce the original literally.
The Tsuba’s scalloped cushion-shaped case remains unchanged and measures 38.3mm across (excluding the crown) and 8.91mm thick. It is made from 316L stainless steel, with brushed and polished surfaces. It features sapphire crystal on the front and a shaped sapphire crystal window on the back. On the reverse, you’ll find an engraved historical map and the geographical coordinates of Graham’s former workshop on Fleet Street. Water-resistance is 30m.
The Tsuba 1720 dial is made from 18k gold and is hand-finished. It is laser-engraved, ceramic-lacquered, and polished, with the Roman numerals lacquered by hand, offering a contemporary rendition of the visuals created by Graham’s original champlevé enamel. An important design change is the positioning of the chapter rings: the hours sit on the outside, with the minutes on the inner scale. The original’s handset thus had to be redesigned: the beetle hand gets a needle extension to reach the outer hours, while the poker hand incorporates a small shelf that follows the inner minutes scale. Unlike the earlier Tsuba models, the Tsuba 1720 lacks the running seconds subdial.
The Tsuba 1720 retains the Vaucher Manufacture calibre 5401 used in the existing collection. This automatic micro-rotor movement measures 30mm in diameter, 2.6mm thick, and comprises 176 components. Its blued tungsten micro-rotor runs on a ceramic ball race; power reserve is 48 hours. The free-sprung balance oscillates at 21,600 vibrations/hour.
The watch is worn on an integrated stainless steel bracelet with articulated first links. It features a concealed link-adjustment system and a butterfly deployant clasp with push-button release.
Limited to 28 pieces, the PS Horology Tsuba 1720 is priced at CHF 26,000, excluding taxes and shipping. Available directly from the brand, first deliveries are expected in February 2027. For more, visit ps-horology.com.
