Lange & Söhne 1

A. Lange & Sohne

Platinum wristwatch with moonphases & 3-day duration

Reference 109.025

Circa 2005

Case No. 147XXX, Movement No. 378XX

38.5mm. Platinum case numbered 147XXX with thick unpolished lugs, sapphire glass over the movement, case number correctly stamped on the bezel around the movement which is further engraved A. LANGE & SÖHNE GLASHÜTTE i. SA., original signed winding crown. Button to the upper left side for adjusting the date & tiny push button for adjusting the moonphase.

Solid silver dial signed A. LANGE & SOHNE GLASHUTTE I/SA DOPPELFEDERHAUS, with eccentric hour and minute ring with tritium markers and hands, calendar aperture, up & down sector, seconds and moonphase.

Cal. L901.5 three quarter plate nickel-finished lever movement, 54 jewels, finely hand-engraved balance bridge, swan neck regulator, fully signed and numbered

Black crocodile strap with the original platinum Lange buckle

Judging by published case numbers (mainly auction examples) for the 109.025, it appears that Lange make only between 20-25 examples of the 109.025 each year. The Lange 109.025 was introduced to the market in 2002; The Lange 1 Moonphase model features another technological advancement, a waxing and waning moon that never stands still as long as the watch is wound. While most moon phases click into position and don't move again until a certain segment of time has passed (typically one day), the Lange 1 Moonphase offers the most reliable depiction of moon time because it is always in motion. The moonphase disc is connected to the continuum of the hour wheel and emulates the moon's orbit with a deviation of merely .002 percent. The new Lange 1 Moonphase errs by only 1.9 seconds per day, or 57 seconds per lunar orbit (a total of about 11 minutes per year), as compared to other moonphase watches whose inaccuracies result in approximately 44 minutes per year.

Box and Lange Certificate