The HM Perpetual Moon watch is an addition to the ‘Royal Collection’ series of Arnold & Son. It’s called the Perpetual Moon because of the accuracy of the moon phase movement that deviates by only one day in every 122 years and the deviation can be corrected with a single push on the corrector.
The three-dimensional, hand-engraved moon phase display is made of silver and is detailed very intricately.
There is another indicator on the flip side of the watch, visible through a transparent back case. The moon can be in two different cases namely, stainless steel and 18K rose gold. The dial also has three options; one being a black guilloche dial, the second one is a blue guilloche dial and the last one is a cream colored dial.
Beneath the guilloche dial there is 1512 hand wound mechanical movement which comprises of more than 27 jewels.