- Movement
- Self-winding
- Size
- 36.5 mm
Overview
A perpetual calendar kept ultra-thin
The Vacheron Constantin Traditionnelle Perpetual Calendar Ultra-Thin, reference 4305T/000G-B948, in 18K white gold with a gem-set bezel and a blue-grey mother-of-pearl dial, on a light blue alligator leather strap. Self-winding calibre 1120 QP with day, month, leap year and moon phase shown by hands; 36.5 mm, 8.43 mm high, certified to the Hallmark of Geneva.
This execution is the same Traditionnelle Perpetual Calendar Ultra-Thin case and calibre 1120 QP movement as the base reference, in 18K white gold with a gem-set bezel (the page gives no diamond count) and a blue-grey tinted mother-of-pearl dial with silver-toned opaline moons. It is worn on a light blue alligator leather strap with a white gold Ardillon buckle, and the page states the strap is interchangeable, though it names no additional strap supplied with this reference.
Vacheron Constantin's Traditionnelle Perpetual Calendar Ultra-Thin is built across this family in 18K white or pink gold. The brand describes the case as keeping to the Traditionnelle collection's usual look: round with lugs stepped away from the case, a slim bezel and a case back cut with fluting; the dial's minute track is railway-style, read against dauphine-shaped hour and minute hands. The case measures 36.5 mm across and 8.43 mm high. The silver-toned dial carries a full perpetual calendar -- hours, minutes, a hand-type day and month, a leap-year counter running to 48 months, and what the brand calls a precision moon phase -- closed on an alligator leather strap by an Ardillon buckle in the case's own metal.
Inside is the automatic calibre 1120 QP, Vacheron Constantin's ultra-thin self-winding base fitted with a perpetual calendar module: 29.6 mm across, 4.05 mm high, 276 parts and 36 jewels, running at 19,800 V.P.H. (2.75 Hz) with a stated 40-hour power reserve. The movement carries the Hallmark of Geneva. The brand's own account traces that mark back to 1886, when the Republic and Canton of Geneva adopted it as a guarantee of quality for watches finished to its own standard, and says today it stands for provenance, sound workmanship and reliability rather than any single technical figure.
For collectors
The five references built on this case and calibre differ in metal, dial finish and hand colour -- including whether the hands and hour-markers are toned to match the case or set against it -- worth comparing directly rather than assuming beyond the shared case and movement.
Key details
Design and engineering
- CaseRound, 36.5 mm across and 8.43 mm high, in 18K white gold, with lugs stepped away from the case, a slim bezel and a fluted case back -- the brand frames these details as the Traditionnelle collection's standing look. The bezel is gem-set, though the page gives no diamond count for it. Transparent sapphire case back, water-resistant to 30 m.
- DialBlue-grey tinted mother-of-pearl, with silver-toned opaline moons against an opaline blue-grey sky, a railway-style minute track and 18K gold dauphine hour and minute hands and applied hour-markers.
- Perpetual calendarDay, month and a leap-year counter running to 48 months are shown by hand, alongside a moon-phase display the brand calls precision-set; the full calendar is read by hands rather than through apertures.
- CertificationCertified to the Hallmark of Geneva.
- Strap and buckleLight blue alligator leather strap, closed by a white gold Ardillon buckle; the page states the bracelet is interchangeable, though it lists no additional strap for this reference.
Calibre 1120 QP
- Self-winding, ultra-thin base with a perpetual calendar module
- Perpetual calendar by hands: day, month, leap year (48-month counter), moon phase
- 29.6 mm across, 4.05 mm high; 276 parts, 36 jewels
- 19,800 V.P.H. (2.75 Hz)
- Power reserve 40 hours
- Hallmark of Geneva
Specifications
Technical specifications
| Reference | 4305T/000G-B948 |
|---|---|
| Collection | Traditionnelle |
| Calibre | Calibre 1120 QP |
| Movement | Self-winding |
| Functions | Hours, Minutes, Perpetual calendar by hands, Hand-type month, Hand-type day, Leap year by 48 months counter, Moon phase |
| Case dimensions | 36.5 mm |
| Case thickness | 8.43 mm |
| Case material | 18K white gold |
| Case back | Transparent sapphire crystal caseback |
| Water resistance | 3 bar (30 m) |
| Dial | Blue grey tinted mother-of-pearl dial. Silver-toned opaline moons with an opaline blue grey sky. Railway minute-track. 18K gold dauphine-style hour/minute hands and applied hour-markers. |
| Strap | Light blue alligator leather |
| Interchangeable strap | Yes |
| Clasp | White gold ardillon buckle |
| Movement dimensions | 29.6 mm × 4.05 mm |
| Components | 276 |
| Jewels | 36 |
| Power reserve | 40 hours |
| Frequency | 19,800 vph (2.75 Hz) |
| Certification | Hallmark of Geneva |
Buying with HYPA
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