Limited Edition: 28 pieces
Case: platinum
Size: 44mm
Movement: hand-wound manufacture caliber A&S1021
Function: three-dimensional astronomical moon phase with age-of-the-moon indicator on the backside
Power Reserve: approximately 90 hours
Water Resistance: 30m
Dial: white mother-of-pearl time display above an aventurine crystal base; moon (12mm) in grey marble and aventurine crystal
Hands: blued steel
Caseback: sapphire crystal
Strap/Bracelet: hand-stitched alligator leather
Factory Warranty: two years

Centered on the moon theme so dear to Arnold & Son, Luna Magna Platinum is a limited series of only 28 pieces. The smooth, understated shine and weight of the platinum give the piece a certain majesty. Set in aventurine crystal, the metallic crystals bring the dial to life with their brilliance. Half of the 12mm three-dimensional moon is made of grey marble, and the other half of aventurine crystal, reflecting the moon's dual nature. Guided by an exclusive moon-phase complication, this chiaroscuro, this movement of the light, make the Luna Magna Platinum a living, ever-changing, fleeting yet everlasting timepiece.

The celestial mechanism also owes its sophisticated design to the fidelity in its astronomical accuracy. A complete lunar cycle is 29 days, 12 hours, 44 minutes, and 2.8 seconds. Arnold & Son have succeeded in approximating this cycle such that, if the watch was never stopped, it would take 122 years for the moon-phase display to accumulate a day's discrepancy from the correct phase. And the correction is easy since Luna Magna Platinum's lunar function is accessible directly from the crown. A practical solution made possible by Arnold & Son's total mastery of the watchmaking process.