Seamaster 600 'PloProf', Purchased 8th April 1974 — Omega. A stainless steel automatic diver's calendar wristwatch

Sign in to download a work market report (PDF) — placement, comparables, and the artist's market, generated from the record.

Estimate: £4,000–£6,000 hammer ≈ $5,409–$8,114
Result
Performance
Sale: Bonhams — London Watches, London, Knightsbridge · 25 February 2026
Record ID: TB-2026-042050
Record: first seen 20 Jul 2026 · updated 20 Jul 2026 · source ↗
Cite this record: TB-2026-042050 — https://thebasis.art/cite/TB-2026-042050

Heuer. A Stainless Steel Automatic Calendar Wristwatch, Seamaster 600 'PloProf', Purchased 8th April 1974. Bonhams, 25 Feb 2026, lot 49. bought in (did not sell). TheBasis.Art, TB-2026-042050.

Cite this record permanent · resolvable · quotable

Appraisal reports, insurance claims, catalogue entries and footnotes. The identifier never changes, and anyone can resolve it back to this page at https://thebasis.art/cite/TB-2026-042050.

Heuer. A Stainless Steel Automatic Calendar Wristwatch, Seamaster 600 'PloProf', Purchased 8th April 1974. Bonhams, 25 Feb 2026, lot 49. bought in (did not sell). TheBasis.Art, TB-2026-042050.

Test the link

The citation omits the realized price because this record is not unlocked. Everything else in it is complete and permanent.

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
Speedmaster Professional, Ref: 145022-69 ST, Circa 1971	Omega. A Stainless Steel Manual Wind Chronograph Bracelet Watch	£3,000–£4,000
Constellation, Ref: 1685004, Birmingham Hallmark for 1963	Omega. An 18k Gold Automatic Calendar Bracelet Watch	£2,000–£3,000
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
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Seamaster 600 'PloProf', Circa 1970	$6,871	Bonhams, May 2025
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Ingenieur Mission Earth Plastiki, Ref: 3236, No.1000/1000, C		Bonhams, Dec 2019
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Calculator, Circa 1977		Bonhams, Sep 2021
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Submariner, Ref: 16800, Circa 1984		Bonhams, Feb 2026
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Luminor Due, Ref: OP7148, Circa 2013		Bonhams, Mar 2024
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Submariner, Ref: 1680, Circa 1975		Bonhams, Sep 2025
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Ingenieur Mission Earth Plastiki, Ref: 3236, No.0724/1000, C		Bonhams, Feb 2019
Heuer. A Stainless Steel Automatic Calendar Wristwatch	Ingenieur SL, Ref: 3506.1, Circa 1980		Bonhams, May 2024

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.