Arnold & Son Time Pyramid 42.5 Red Gold
1TPER.W01A.C153A
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The Arnold & Son Time Pyramid 42.5 Red Gold redefines traditional watchmaking with its revolutionary vertical movement layout, inspired by 19th-century clock designs. This timepiece showcases a distinctive pyramid-shaped skeleton movement, elegantly displayed through its rose gold case. The unique placement of the crown at six o’clock and the avant-garde use of aventurine glass in the caseback further enhance its originality. The movement’s gold-plated and NAC-treated finishes, along with the symmetrical arrangement of power-reserve indicators, highlight Arnold & Son’s commitment to precision and innovation. With a robust 90-hour power reserve and a striking visual impact, the Time Pyramid is a testament to the brand’s creative prowess and horological excellence.
Full Specification
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Brand Arnold & SonCollectionTime PyramidSeriesN/AModel No1TPER.W01A.C153A
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MovementFeatures Double Power Reserve Indicator, Small SecondsMovement Manual WindingCalibre A&S1615CaseCase Size 42.5 mmCase Shape RoundCase Material Rose GoldCase Back See-through Case BackGlass Material Sapphire CrystalDialDial Colour SkeletonIndexes Roman NumeralsStrapStrap Material LeatherStrap Colour BlueClasp Type Pin BuckleBuckle/Clasp Material Rose GoldOtherGender MenWater Resistance (M) 30Limited Edition YesWarranty Period 2 YearsCountry of Origin Switzerland
Product Video
About the Arnold & Son Time Pyramid Collection
Arnold & Son's catalogue is the perfect roll call of outstanding haute horlogerie watches. Their Time Pyramid model, introduced in 2013, is a suitable illustration of the aforesaid. It's a collection where historical watchmaking joins the art of skeletonisation. Inspired by the English clocks of the 1830s and John Arnold's creations, the Time Pyramid spellbinds with its vertically aligned, pyramid-shaped movement whose unencumbered view is visible through a skeletonised front. As a result, the movement is the ultimate attraction of a Time Pyramid watch, leading the way both aesthetically and mechanically.
The Trilateral Movement - An Unparalleled Watchmaking And Design Feat
Repudiating the conventional arrangement of movement components into a circle, Arnold & Son have distinctively assembled the organs from top to bottom. The gear train is at the centre with two mainspring barrels at the bottom of the case, and the escapement and balance wheel are located at 12, creating a perfectly symmetrical triangular architecture. This configuration places the screw crown at six instead of the traditional three o'clock position due to the barrels being at the foot of the case. The two barrels provide a staggering 90 hours of power reserve, marked by two indicators on each side of the skeletonised dial via graduated dots in crescent-shaped counters. The main timekeeping functions are located above the gear train, at the centre. All Arnold & Son Time Pyramid watches are equipped with manual-wound movements. A few iterations of the watch also came with the tourbillon escapement.
Features
Transparency ruled the roost in early models of the Time Pyramid collection with completely skeletonised front and back. However, recent Arnold & Son watches from this collection have been graced with a beautiful aventurine backdrop and white opal dials. The current Time Pyramid line-up includes watches in precious metals such as red gold and platinum.

ABOUT THE MOVEMENT
Movement is both the soul and the body of Time Pyramid watches, inspired by the regulators and clocks designed by John Arnold. Calibre A&S1615, powering the non-tourbillon iterations within the collection, is a multi-dimensional manual-winding movement. It features a vertical gear train in a linear arrangement connected to two barrels at six o’clock and the escapement at 12, forming a pyramidal structure. The calibre also supports two power reserve indicators, which show how the barrels work in a relay format, where the right barrel starts providing power when the energy in the left is extinguished, thereby maintaining optimum power for a total of 90 hours.

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- Brand Arnold & Son
- Reference A&S1615
- Movement Manual Winding
- Display Analog
- Power Reserve Approx. 90 hours
- Jewels 27
- Frequency 21600 bph
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