Monza, Ref: 150.501, Circa 1975 — Heuer. A black stainless steel automatic calendar chronograph wristwatch

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Estimate: £1,500–£2,000 hammer ≈ $2,110–$2,814
Result
Performance
Sale: Bonhams — Watches and Wristwatches, London, Knightsbridge · 23 February 2021
Record ID: TB-2026-648133
Record: first seen 21 Jul 2026 · updated 21 Jul 2026 · source ↗
Cite this record: TB-2026-648133 — https://thebasis.art/cite/TB-2026-648133

Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch, Monza, Ref: 150.501, Circa 1975. Bonhams, 23 Feb 2021, lot 27. bought in (did not sell). TheBasis.Art, TB-2026-648133.

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Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch, Monza, Ref: 150.501, Circa 1975. Bonhams, 23 Feb 2021, lot 27. bought in (did not sell). TheBasis.Art, TB-2026-648133.

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From the same sale Watches and Wristwatches · Feb 2021

Lot	Artist	Estimate
Circa 1900	Lecoultre & Cie. A Miniature Continental Gold Keyless Wind Open Face Pocket Watch	£800–£1,200
Speedmaster, Ref: 145.012-67 SP, Circa 1967	Omega. A Stainless Steel Manual Wind Chronograph Bracelet Watch	£7,000–£9,000
GMT Master, Ref: 16753, Circa 1986	Rolex. A Stainless Steel Automatic Calendar Bracelet Watch With Dual Time Zone	£7,000–£9,000
Explorer, Ref: 1002, Circa 1960	Rolex. A Stainless Steel Automatic Bracelet Watch	£4,000–£6,000
Gondolo, Ref: 4824, Purchased 10th November 2000	Patek Philippe. A Lady's 18k Gold Quartz Rectangular Wristwatch	£3,500–£4,500
Cassiope, Ref: 4R3B/40, Purchased 7th July 2020	Korloff. A Lady's Stainless Steel And Diamond Set Quartz Reversible Wristwatch With Dual Mother Of Pearl Dials	£1,200–£1,800

Comparable results nearest sold works, same medium & price band

Artist	Lot	Result USD, incl. premium	Sale
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Conquistador, Ref: 8005 CC, c. 2005	$2,432	Bonhams, Jun 2025
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Monaco, Ref: CS2111, Purchased 13 October 2001		Bonhams, May 2023
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Monaco, Ref: 1533, Circa 1970		Bonhams, May 2019
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Monaco Gulf, Ref: CBL2115, c. 2005s		Bonhams, Nov 2024
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Carrera, Ref: CAS2112, Circa 2005		Bonhams, Jul 2020
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Verona, Ref: 110.215N, Circa 1978		Bonhams, May 2025
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Arceau, Ref: AR4.910, Circa 2000		Bonhams, Nov 2024
Tag Heuer. A Stainless Steel Automatic Chronograph Calendar Wristwatch	Calculator, Ref: 110.633, Circa 1977		Bonhams, Sep 2020

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.