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The Encyclopedia of Horology

Wristwatch · Triple calendar moonphase wristwatch

Zodiac Triple Date Moonphase Wristwatch, Ref. 1721

Partially verified

This is a vintage Zodiac Triple Date Moonphase wristwatch, reference 1721, attributed by the source to the 1950s. The watch features a round gold-tone stainless steel case reported at 33 mm in diameter, enclosing a beige dial with applied Arabic numerals, arrow markers, twin day and month apertures below 12 o'clock, a moonphase aperture above 6 o'clock, and an outer pointer date track. According to the seller, it is powered by a 17-jewel manual-wind caliber Zodiac 1100 movement operating at 18,000 vibrations per hour.

Front view of the Zodiac Triple Date Moonphase wristwatch showing the dial, hands, calendar windows, and moonphase display
Front view of the Zodiac Triple Date Moonphase wristwatch showing the dial, hands, calendar windows, and moonphase display — SECOND HAND HOROLOGY. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
secondhandhorology.com
Category
Wristwatch · Triple calendar moonphase wristwatch
Maker / attribution
Zodiac
Reference
1721
Catalogue / lot identifier
WA-6707
Source-reported date
1950s
Country
Switzerland
Source-reported serial
357515

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Case and Construction

The watch features a round, gold-tone stainless steel case reported to be 33 mm in diameter. It is designed with a fixed bezel and straight-tapered lugs, with quick-set pushers located at the 2 o'clock and 4 o'clock positions.

The case back is marked 'Zodiac W. Ltd. LeLocle Swiss 905 Fond Acier Inoxydable' and includes the serial number 357515. The watch is mounted on a black leather strap.

Evidence for this section
  • “housed in a 33 mm round gold-tone stainless steel case with the two quick-set pushers at 2 and 4 o’clock.”
  • “Case Back Markings: Zodiac W. Ltd. LeLocle Swiss 905 Fond Acier Inoxydable 357515”

Dial Configuration

The beige dial features applied gold-tone Arabic numerals at the 12, 2, 4, 6, 8, and 10 o'clock positions, interspersed with arrow-style hour indices. An outer perimeter serves as a track for the central pointer date hand.

Calendar functions are displayed through twin rectangular apertures below the 12 o'clock position and a moonphase aperture located above 6 o'clock, with 'Zodiac' text printed below the cutout.

Evidence for this section
  • “Beige dial features twin rectangular apertures reading 'WED' and 'AUG' beneath 12 o'clock.”
  • “Applied gold-tone Arabic numerals at 12, 2, 4, 6, 8, and 10 interspersed with arrow hour indices.”

Mechanism

The watch is described as a manual-wind timepiece powered by a 17-jewel Zodiac caliber 1100 movement. The movement is reported by the seller to be based on the ETA 1100, with an operating frequency of 18,000 vibrations per hour and an estimated 42-hour power reserve.

Features cited by the seller include sweep seconds, anti-magnetic and shock-resistant properties, and quick-set functionality for the calendar and moonphase.

Evidence for this section
  • “powered by the original Zodiac mechanical movement, caliber Zodiac 1100 (based on ETA 1100), with 17 jewels”
  • “The movement runs at 18,000 vibrations per hour and has an approximate power reserve of 42 hours.”

Open research questions

  • What is the specific production timeframe for reference 1721?
  • Does the '905' stamp on the case back correspond to a specific case material variant?

Source evidence

Recorded claims and source quotations for Zodiac Triple Date Moonphase Wristwatch, Ref. 1721
FieldSource-reported valueSource quotation
Reference1721“reference 1721 dated from the 1950s”
CaliberZodiac 1100 (based on ETA 1100)“caliber Zodiac 1100 (based on ETA 1100)”
Jewel count17 jewels“with 17 jewels and sweep seconds”
Case diameter33 mm“housed in a 33 mm round gold-tone stainless steel case”
Case back markingsZodiac W. Ltd. LeLocle Swiss 905 Fond Acier Inoxydable 357515“Zodiac W. Ltd. LeLocle Swiss 905 Fond Acier Inoxydable 357515”
Frequency18,000 vph“Frequency: 18,000 vph”
Era1950s“reference 1721 dated from the 1950s”
Included ItemsOriginal box and registry card“It is presented with its original box and registry card.”

Visible details

  • Round gold-tone case fitted with a stepped bezel and straight-tapered lugs.
  • Beige dial features twin rectangular apertures reading 'WED' and 'AUG' beneath 12 o'clock.
  • Moonphase aperture situated above 6 o'clock with 'Zodiac' text printed below the crescent cutout.
  • Outer perimeter calibrated with a 1 through 31 date scale traversed by a central pointer hand.
  • Applied gold-tone Arabic numerals at 12, 2, 4, 6, 8, and 10 interspersed with arrow hour indices.
  • Watch is mounted on a black textured leather strap.

Research qualifications

  • Internal caliber details, movement condition, and case back inscriptions are source-reported and not visible in the provided image.
  • Servicing, timing, and originality statements are vendor claims.

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

Zodiac Triple Date Moonphase Watch Ref 1721 Vintage 1950s Box – SECOND HAND HOROLOGY

Reviewed 2026-10-25 · Record 9bcfd73313

Terms in this record

Glossary explanations for terms named in this object’s record.

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