A. Lange and Sohne Langematik Sax-O-Mat Big Date Automatic Platinum. Model reference 308.025. This is a platinum A. Lange & Sohne Langematik Big Date, reference 308.025. It has an alligator leather strap with a platinum ALS tang buckle, and a scratch resistant sapphire crystal. It has a screw-down winding crown with a zero-reset mechanism that causes the seconds hand to jump to the zero position for setting the exact time, and the rectangular push bar on the case band at 10’clock adjusts the date. There is an exhibition sapphire display case back secured with 6 screws, and engraved around the perimeter with “A. LANGE & SOHNE – GLASHUTTE, SA.,” a serial number and hallmarks. The 37mm diameter three-body solid case, curved lugs, and angled bezel are polished. There is a frosty solid silver dial with applied 18K white gold baton index markers around a perimeter minute scale, and white gold alpha hands with luminous inserts. There is a steel recessed circular running small seconds subsidiary dial at the 6 o’clock position, and a double frame aperture window for the big date at 12 o’clock. It has a 46-hour power reserve at full wind, and it’s water resistant to 30 meters/100 feet. The 10mm thick case, dial, and movement are all signed.
This A. Lange & Sohne Langematik Big Date 308.025 has a mechanical automatic Lange caliber L921.4 movement. It has a Glashütte German silver ¾ plate, with hand engraved and fausses cotes embellishment. It’s constructed with 45 jewels, a shock absorber device, and a straight-line lever escapement. There is a monometallic balance that’s adjusted to 5 positions, the patented Lange self-compensating flat balance spring, and a swan neck micrometer regulator. There is a 21K gold micro-rotor with a platinum segment.
The A. Lange & Sohne Langematik Big Date 308.025 was released in 2000.
The watch comes in original packaging, with a set of documents.