Jaeger-LeCoultre Master Ultra Thin 36 mm Green Sapphire

Case, dial & bracelet

Case dimensions

36 mm

Case thickness

10.2 mm

Case material

Sapphire crystal case

Bezel

Fluted 18k gold

Crystal

Box sapphire with AR coating

Dial

Green sunburst

Hands

Skeletonised sword hands, white luminescent

Indexes

Applied Roman numerals

Bracelet / strap

Jubilee bracelet

Clasp / buckle

Triple-folding clasp with safety catch

Water resistance

50 m

Movement

Movement / calibre

Calibre 59A — In-house automatic with 22k gold rotor

Movement type

High-frequency automatic

Frequency

28,800 vph (4 Hz)

Power reserve

38 hours

Number of jewels

33 jewels

Complications

Moon phase

Functions

Hours, minutes, seconds, date

Watchmaker

Finishing, assembly and timing are carried out in the manufacture's own atelier.

Production & market

Production period

1970 – 1981

Limited-edition quantity

Not applicable

Current market information

Values have stabilised after the 2022 correction; condition and box-and-papers drive the premium.

Designer

In-house design studio

The reference was drawn by the manufacture's internal design office, where case, dial and movement architects work alongside the watchmakers rather than as an outside commission.

Historical significance

Jaeger-LeCoultre Master Ultra Thin 36 mm Green Sapphire sits within Jaeger-LeCoultre's Master Ultra Thin line, introduced in 1970. It carries the house codes established since 1833 — sapphire crystal case case, green sunburst dial and in-house automatic with 22k gold rotor — and is one of the references collectors use to date the evolution of the collection.

Interesting facts

• Early production dials show a slightly different minute track, and collectors pay a premium for them.
• The bracelet tapers across its length, which is why the profile looks thinner on the wrist than the specification suggests.
• The case is finished by hand, alternating polished and satin-brushed surfaces in a single pass so the edges stay razor sharp.