Wristwatch · Minute repeating perpetual calendar chronograph wristwatch

IWC Grande Complication Ref. 3770 Wristwatch

Partially verified

This IWC Grande Complication reference 3770 is a neo-vintage automatic wristwatch manufactured circa 1999 in a limited edition of 50 pieces, numbered 11/50. Cased in platinum with a 42 mm diameter and weighing 184 g, the watch incorporates a minute repeating mechanism, chronograph, perpetual calendar, and moon phase indication. Its white dial features applied baton indexes, gold hands, four subsidiary registers displaying date, day, month, chronograph counters, continuous seconds, and an aperture for the moon phase, accompanied by a four-digit year indicator displaying '20 10'. It is powered by automatic calibre 79091 and fitted with a black alligator strap secured by a platinum original clasp.

IWC Grande Complication reference 3770 platinum wristwatch — Auktionen Dr. Crott / Invaluable. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: www.invaluable.com
Category: Wristwatch · Minute repeating perpetual calendar chronograph wristwatch
Maker / attribution: IWC / Intern. Watch Co.
Reference: 3770
Catalogue / lot identifier: 127
Source-reported date: circa 1999
Country: Switzerland
Source-reported serial: 2754045

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

Identity and Provenance

This IWC Grande Complication, reference 3770, is a neo-vintage automatic wristwatch, stated to be from circa 1999. It is identified as number 11 from a limited edition of 50 pieces.

The timepiece is cased in platinum with a reported weight of 184 g. It is sold with an original black alligator leather strap, an original platinum clasp, the original box, and a certificate.

Evidence for this section

“Ref. 3770, Cal. 79091, Case No. 2754045, Dimensions 42 mm, circa 1999, Limited 11/50, Weight 184 g”
“Original box, Original certificate, Accessories, platinum original clasp”
“Case: Platinum”
“original black alligator leather strap”

Dial and Visual Construction

The white dial features applied indexes and gold baton hands. Indications include auxiliary seconds, 30-minute and 12-hour chronograph counters, and a perpetual calendar displaying the day, date, month, and year.

A pusher on the left side of the case operates the minute repeating mechanism. The watch uses bossed sapphire glass, which is described as being suspended on a platinum membrane.

Evidence for this section

“Dial: White, applied indexes, auxiliary seconds, 30 min. and 12h counter, day, date, month and year display, gold baton hands.”
“This design has a pusher on the left side of the case which strikes the time”
“the glass was suspended on a platinum membrane to amplify the sound of the gongs. The bossed sapphire glass itself also contributes to the purity of the tone.”

Mechanical Specifications and Condition

The movement is identified as IWC Calibre 79091. The mechanism comprises 659 parts, including 71 bearing stones and 12 patents. It includes a perpetual calendar and a minute repeating striking system using two precision hammers and two gongs.

The condition of the case and dial are reported as very good. The movement is described as capable of running, though cleaning is recommended.

Evidence for this section

“Cal. 79091”
“The "Grande Complication" has 659 mechanical parts, thereof 71 bearing stones, 12 patents and 21 functions and indications”
“Two small precision hammers strike two gongs”
“Case: very good. Dial: very good. Movm.: very good, capable of running, cleaning recommended.”

Open research questions

What is the current service status of the movement, given the recommendation for cleaning?
Are there specific maintenance requirements for the platinum membrane suspension system of the sapphire glass?

Source evidence

Recorded claims and source quotations for IWC Grande Complication Ref. 3770 Wristwatch
Field	Source-reported value	Source quotation
Reference	3770	“Ref. 3770”
Calibre	79091	“Cal. 79091”
Case Number	2754045	“Case No. 2754045”
Dimensions	42 mm	“Dimensions 42 mm”
Limitation	11/50	“Limited 11/50”
Material	Platinum	“Case: Platinum”
Origin	Schweiz	“Origin Schweiz”
Calendar Capacity	500 years	“a perpetual calendar for the next 500 years”

Visible details

White dial with four sub-dials providing calendar, chronograph, and astronomical readings.
Year aperture positioned between 7 and 8 o'clock indicating '20 10'.
Repeater slide/pusher mounted on the left side of the case band at 9 o'clock.
Stepped bezel and fluted lugs fitted to a black leather alligator strap.

Research qualifications

Internal movement condition, calibre number, and case back engravings are not visible in the provided image.
The auction condition report notes that cleaning is recommended for the movement.

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

Consulted source

Sold at Auction: IWC / Intern. Watch Co. - Grande Complication

Reviewed 2026-10-26 · Record 7f28e4451b

Terms in this record

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