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Heuer-Leonidas
Sternzeit Reguliert 
Lot No. 293
Lot No. 293
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A large military flyback chronograph of the German Air Force (Bundesluftwaffe)
Estimate  9,000 - 12,000 €
a lot of the last auction!
Product Details
CASE
Steel, screwed back with military engraving: BUNDESWEHR 6645-12-148-2298, bidirectional rotating bezel with 60 minutes division.
very good, slightly worn.
DIAL
Black.
very good.
MOVEMENT
Manual.
very good, capable of running, cleaning recommended.
REF.
1551 SGSZ
CAL.
Valjoux 230
CASE NO.
3941
DIMENSIONS
43 mm
CIRCA
1968
ORIGIN
Swiss
Product Description

This watch is a measuring instrument rather than an aviator’s watch. The chronograph is regulated for sidereal-time and was part of the supplementary equipment "surveying theodolite"; it was used for the determination of time during azimuth evaluations (determined angle sizes). Sidereal-time comes from the fact that the Earth makes a full rotation in its axis every 23 hours, 56 minutes and 3,5 seconds. Sidereal-time is used when determining a location's exact co-ordinates on the Earth's surface. It was for this purpose that this watch was regulated to sidereal-time. As it also keeps normal time, "STERNZEIT REGULIERT" (sidereal-time regulated) was printed on the watch's dial face to prevent it from being mistaken with the standard chronograph.
Source: "Militäruhren" by Konrad Knirim, Bottrop 2002, p. 576.
The Bundeswehr’s Heuer flyback chronographs were produced according to the specifications of the different units of the troop, so that several variations of the model exist.
This watch is one of those models that only very rarely appear on the market - it is also in outstanding condition.

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