Initially launched in 2003 as a limited edition of 101 pieces, of which the present set is number 8, The Grand Lange 1 "Luna Mundi" is delivered as a set of two watches, respectively, the Luna Mundi Ursa Major and Luna Mundi Southern Cross.

Each one of these timepieces correctly and accurately indicates the moon’s position as seen from different hemispheres. The white gold model features the Ursa Major constellation on the dial and depicts the phases of the moon as seen in the Northern Hemisphere. In contrast, the pink gold model features the Southern Cross and depicts the phases of the moon in the Southern Hemisphere.

Going back in history through centuries, sailors and world travellers would truly notice the dramatic change of stars and constellations one can experience according to their current position. Uniquely, only the full and new crescents of the moon appear symbiotically both in the northern and southern hemispheres. The present Grand Lange 1 Luna Mundi wristwatches display true-to-life moon phases as seen on both sides of the equator, which will need setting once every 122.6 years. The watch industry, being based since its very conception on the northern hemisphere, has long forgotten these subtle differences in hemispheres, stars and constellations. Only now, companies like A. Lange and Söhne have set quest to rectify the said error, end this "northern" focus and display realistic moon phases.

The exquisite dials and cases of these two watches bear the signature of A. Lange & Söhne further compel any true connoisseur and aficionado to truly understand the opportunity to acquire this rare set of matching number '8' limited edition pieces.