Heuer Bundeswehr 1551 SGSZ Sternzeit Reguliert

The Heuer Bundeswehr "Sternzeit Reguliert" Ref. 1551 SGSZ is one of the rarest and most sought-after military watches. Developed for the German Armed Forces and introduced in 1968, it was produced in an extremely limited edition of an estimated 30 to 50 pieces. It combines military history, technical precision and maximum exclusivity to create a true collector's item.

While most Heuer Bundeswehr models, known to collectors as the "Bund", were intended for air force pilots, the "Sternzeit Reguliert" has a special status. This special version was used exclusively by the army artillery, where accurate time measurement was essential for ballistic calculations and the alignment of theodolites. Theodolites are high-precision surveying instruments for determining horizontal and vertical angles, and were used, among other things, for rocket launches.

Unlike conventional watches, which are based on solar time, this watch is based on sidereal time. The reason? The Earth does not take exactly 24 hours for a complete rotation, but rather rotates in 23 hours, 56 minutes and 3.5 seconds according to sidereal time, and the help of the stars of sidereal time is needed to determine the coordinates of locations on the Earth.

This regulation of sidereal time was crucial for military operations, especially for precise calculations in artillery and air navigation. To avoid confusion with standard time, the dial is marked "Sternzeit Reguliert" (Sidereal Time Regulated), because the watch has a time advantage over standard time.

The original NATO procurement number "Bundeswehr 6505-12-148-2298" is engraved on the case back, confirming the military origin of this watch. The model designation "1551 SGSZ", where "SGSZ" stands for "Sternzeit" (German for sidereal time), underlines the special function of this watch.

This extremely rare Heuer Bundeswehr 1551 SGSZ is in outstanding condition and comes with the original military accessories.

- 2 Bundeswehr leather straps (EULIT 3-piece strap, reference 6645-12-146-6415/6 BUND)
- Original leather pouch with complete accessories ("AVIAT * NAVIGATION - SET", stamped "BUND 6605-12-124-9482").

The Heuer Bundeswehr "Sternzeit Reguliert" Ref. 1551 SGSZ is more than just a wristwatch - it is a fascinating historical instrument. Its extreme rarity, its unique history and its excellent condition make it an absolute highlight for discerning collectors.

Condition report
Dial: perfect untouched condition - original, 100% intact luminous material in hands and markers - signed "Sternzeit Reguliert".

Case: excellently preserved case - slight signs of wear - deep engravings on the back: "BUNDESWEHR", supply number 6645-12-148-2298 - intact case number between the lugs - perfectly preserved rotating bezel.

Movement: Hand-wound Valjoux MN 230 caliber - flyback chronograph - values on the timegrapher: rate deviation: 9s/day, amplitude: 283, beat error: 2.8. All functions operate perfectly.

Case number: 39xx

Int.Exe: 80510