Constellation, Ref: 1685004, Birmingham Hallmark for 1963 — Omega. An 18K gold automatic calendar bracelet watch

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Estimate: £2,000–£3,000 hammer ≈ $2,705–$4,057
Result
Performance
Sale: Bonhams — London Watches, London, Knightsbridge · 25 February 2026
Record ID: TB-2026-042056
Record: first seen 20 Jul 2026 · updated 20 Jul 2026 · source ↗
Cite this record: TB-2026-042056 — https://thebasis.art/cite/TB-2026-042056

Omega. An 18k Gold Automatic Calendar Bracelet Watch, Constellation, Ref: 1685004, Birmingham Hallmark for 1963. Bonhams, 25 Feb 2026, lot 56. bought in (did not sell). TheBasis.Art, TB-2026-042056.

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Omega. An 18k Gold Automatic Calendar Bracelet Watch, Constellation, Ref: 1685004, Birmingham Hallmark for 1963. Bonhams, 25 Feb 2026, lot 56. bought in (did not sell). TheBasis.Art, TB-2026-042056.

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From the same sale London Watches · Feb 2026

Lot	Artist	Estimate
Prince, Ref: 1527, Circa 1930	Rolex. A Two Colour 18k Gold Manual Wind Wristwatch	£4,000–£6,000
Prince Aerodynamic, Ref: 3361, Circa 1940	Rolex. A 9k Gold Manual Wind Drivers Watch	£7,000–£9,000
Depthomatic, Circa 1960	Nivada Grenchen. A Stainless Steel Automatic Calendar Wristwatch With Depth Gauge	£2,000–£3,000
Seamaster 600 'PloProf', Purchased 8th April 1974	Heuer. A Stainless Steel Automatic Calendar Wristwatch	£4,000–£6,000
Speedmaster Professional, Ref: 145022-69 ST, Circa 1971	Omega. A Stainless Steel Manual Wind Chronograph Bracelet Watch	£3,000–£4,000
Datejust, Ref: 6605, Circa 1956	Rolex. A Fine And Rare 18k Gold Automatic Calendar Bracelet Watch With Depth Rating And 'superlative Chronometer By Official Test' Dial Retailed By Serpico Y Laino	£12,000–£18,000

Comparable results nearest sold works, same medium & price band

Artist	Lot	Result USD, incl. premium	Sale
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Constellation, Ref: 154001, Purchased 13th October 1969	$3,395	Bonhams, Feb 2023
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Date, Ref: 1500, London Import mark for 1965, purchased 14th		Bonhams, Nov 2023
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Ref: 13431 A6, Circa 1970		Bonhams, Feb 2020
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Datejust, Ref: 6917, c. 1975		Bonhams, Sep 2025
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Kingmatic Sub-Sea, Ref: R5279, Circa 1960		Bonhams, May 2019
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Constellation, Ref: 1685415, Purchased 22nd November 1967		Bonhams, Mar 2025
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Constellation, Ref: 166.059/168.047, Circa 1970		Bonhams, Feb 2020
Omega. An 18k Gold Automatic Calendar Bracelet Watch	Constellation, Ref: 168.019, Circa 1969		Bonhams, Nov 2018

The closest sold results by price, artist, and medium — the appraiser's comp set, generated from the corpus. All figures converted to USD at current reference rates.