PS Horology Tsuba Blue steel bracelet wristwatch with white sapphire dial alongside big ben illustration
Collage of watch components, including watch movements, gears, and clock faces, with a central pocket watch displaying a moon phase and Roman numerals.

Origins    

The history and legacy of watchmaking in England heavily influenced Peter Speake’s early career from antique restoration in Piccadilly, to a deep love and fascination with historic marine chronometers and early English pocket watches.

Timeless simplicity

PS Horology Tsuba Blue steel bracelet wristwatch with white sapphire dial inspired by antique pocket watches
Close-up of an antique Dent pocket watch with Roman numerals and a white face, showing time at approximately 9:15.

The timeless simplicity and elegance of antique pocket watches and later vintage wristwatches inspired the clean aesthetic of the Tsuba Blue, whilst blued hands and screws that denote a connection to antique and historic watchmaking as seen in the H4 marine chronometer, inspired the spirit of the Tsuba Blue.

Heritage of blue

Difficult to make and forged for function, blued steel extends across hands, screws, and movements creating a legacy aesthetic, but blue also appears in other ways across more recent English icons. Painted black to hide the dirt from pollution and continuous exposure, the Big Ben clock was recently restored back to its original Prussian blue, revealing an iconic aesthetic. Inspired by these icons, Tsuba Blue’s distinctly English classic index and hand design is combined with modern techniques of printing on sapphire to give a visual depth to its dial details.

Close-up view of a decorative 3D sign with yellow and blue elements mounted on a white wall.
PS Horology Tsuba Blue fabric strap wristwatch with white sapphire dial inspired by antique pocket watches
Close up of John Harrison intricate gold engravings and blued screws on the left, and PS Horology Tsuba Blue silver steel wristwatch with a semi-transparent back showing internal movement on the right.

The heritage of blue - an enduring aesthetic, born from function, made by craft, reflecting traditional elegance, and embodied in the spirit of Tsuba Blue.

Editions

The Tsuba Blue is available on strap or integrated bracelet, and models are not interchangeable. 

PS Horology Tsuba Blue steel bracelet wristwatch with white sapphire dial inspired by antique pocket watches
PS Horology Tsuba Blue wristwatch on a blue fabric strap with white sapphire dial and blue indeces
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The Tsuba case

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PS Horology Tsuba Blue steel bracelet wristwatch showing case back with exposed movement

Technical specifications

  • Made in Switzerland from 316L stainless steel.

    Front and back glass made from sapphire and water resistant to three atmospheres.

    Case measures 38.3mm (from 3 to 9 o’clock across the case excluding winding crown) and 8.91mm thick.

  • Made by Vaucher Manufacture in Fleurier, Switzerland, calibre 5401 with micro-rotor, automatic.

    Measures 2.60 mm in thickness and 30.00 mm (13 ¼”’) in diameter.

    Number of components is 176, and number of synthetic jewels is 29 with a personalised tungsten micro-rotor turning on a ceramic ball race.

    Power reserve 48 hours, and balance wheel is free-sprung.

    Balance frequency 3 Hz (21.600 A/h).

  • Dial centre is made from sapphire, dial frame anodised metal.

  • Synthetic and humidity resistant.

  • Featuring butterfly deployment buckle.

  • Available from Miluxe (Vietnam), Martin Pulli (United States), and PS Horology (Switzerland). Limited to 100 pieces.

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PS Horology Tsuba Blue steel wristwatch on a fabric blue strap with white sapphire dial inspired by antique pocket watches