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Montblanc

Seconde au Centre Retour a Zero Calibre 13.18

 

Some fresh pics of this very rare Montblanc Villeret Minerva timepiece. I believe it is pretty unique because within the Retour a Zero watches it could be the only one with a central second hand doing this job. In fact we are talking about a chronograph center hands that is permanently running without minutes or hours subdials.


The calibre 13.18 was used 58 times in red gold cases with silver dials, 8 pieces in white gold with either black or silver dial and one piece in platinum with mother of pearl dial. My watch gains about 3 seconds a day so the retour a zero function can be used for time-taking pretty well.

Here are some more facts on this particular watch:

Model Seconde au Centre Retour à Zéro

Ident No. 104343

Movement:

Calibre: MB M13.18

Movement type: Manually wound retour à Zéro movement

Chronograph: -

Indications: Central hours - minutes and seconds - seconds hand with zero-reset function

Displays (Chronograph): -

Diameter: 29.50 mm

Height: 6.40 mm

Number of components: 196 components

Number of jewels: 21 jewels (hemispherical, cambered, olive-cut)

Power reserve: Approx. 55 hrs

Balance: Screw balance, Ø 11.40 mm; 26 mg.cm.

Frequency: 18,000 vibrations per hour (2.5 Hz)

Balance spring: With Phillips curve

Plate: Rhodium-plated German silver, circular-grained on both sides, hand-chamfered edges

Bridges: Rhodium-plated German silver, “Côtes de Genève”, recesses circular-grained on both sides, hand-chamfered edges

Going train: Wheels: gold-plated, circular-grained, chamfered, diamond hubs on both sides

Pinions: polished faces and toothing, burnished pivots

Case

Material: 18 K white gold

Bezel: -

Sapphire crystal: Cambered sapphire crystal

Case back: Screwed domed sapphire crystal case back, hinged cuvette with patented release mechanism

Crown: With Montblanc emblem in mother-of-pearl

Dial: Solid 18 K gold dial with hand-crafted silver-plated circular-grained decoration

Hands: 18 K gold, central second hand in Pfinodal ®

Horns: With patented cuvette release mechanism

Diameter: 41 mm

Height: 14.80 mm

Water resistant: 3 bar (30 m)

Strap

Material/Colour: Hand-stitched alligator-skin / Black

Clasp/Buckle: Pin buckle in 18 K white gold

Limitation: 8 pieces


















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