Only Online Auction

Hong Kong, Mar 03, 2021

LOT 191

Patek Philippe for Hölscher
Ref. 3445 / 6, self-winding, date, water-resistant, integrated bracelet; “Monodate”; 18K white gold

HKD 104,000 - 138,000

CHF 12,000 - 16,000 / EUR 11,100 - 14,800 / USD 13,400 - 17,800

18K white gold, self-winding, round-shaped, gentleman’s wristwatch, with subsidiary seconds at 6 and one horological complication:
· Instantaneous date of the month (aperture at 3 o’clock)

Polished two-piece case, water-resistant with screwed case-back.

Silver colour dial with radial applied white gold indexes.

27-460 M calibre, Gyromax balance, self-compensating Breguet hairspring, adjusted to heat, cold, isochronism and 5 positions, 18K yellow gold rotor, “Poinçon de Genève” (Geneva Quality Hallmark or Geneva seal).

Grading System
Grade: AAA


Case: 2-8

Very good

Slightly scratched

Movement: 2 *
Dial: 2-01

Very good

HANDS Original

Brand Patek Philippe, Geneva

Model retailed by Hölscher, Köln (Germany)

Reference 3445 / 6

Year circa 1968

Movement No. 1 126 868

Case No. 324 334 (by Antoine Gerlach, Geneva)

Material 18K white gold

Diameter 35 mm.

Caliber 27-460 M

Dimensions Length 170 mm. (approx.)

Signature dial, case and movement

Accessories original fitted box; Extract from the Archives


The Extract from the Archives, dated February 15, 2021, mentioned that this watch was sold on October 17, 1968.


Patek Philippe, Ref. 3445 Monodate

This reference is launched in 1960-1961 and remained in production until the early-1980s.

It’s the first “simple” calendar wristwatch made by Patek Philippe.

The majority in yellow gold, more rarely in rose gold, even more rarely in white gold or in platinum. The cases by Antoine Gerlach, Geneva.

The last watches produced, circa 1980, bear a sapphire screwed case-back (Ref. 3445-100 by Les Ateliers Réunis, Geneva).

Around 3 000 examples were produced, some with integrated bracelet (Ref. 3445-6, etc.).

According to our research, only ten examples of the Ref. 3445 in platinum are known to have appeared on the open market, three of these have diamond-set dials.


· Patrizzi, 2010, vol. 2, pp. 217-218 (Nos. 899-903, similar watches in various metals).