Living With Bronze, Part 1: Choosing the Right Bronze Watch

This is the first of a three-part series on bronze watches by contributing writer Justin Mastine-Frost. This series will address the various aspects of owning and caring for a bronze watch that extend beyond the obvious passion for patina. Topics covered will include the pros and cons of aging the material naturally versus with chemicals and what you need to successfully clean the metal. First up? A look at why bronze has risen to such immense popularity over the past decade and what you should look for when you’re thinking about purchasing your first bronze watch.

There’s no arguing that there has been an unrivaled boom of bronze in recent years – ushering in what one could only call a new “Bronze Age” in watchmaking. In part fueled by a growing love of unique and individualized timepieces, and in part by the enthusiast community on Instagram, bronze has rapidly become the new “it” metal – especially in the more approachable end of the luxury watch industry. The metal’s transformative properties run contrary to anything else in the market, having the ability to age over time, and depending on the alloy composition, the end result can vary significantly from one watch model to the next. While some will want to maintain that crisp bright bronze color as factory-fresh as possible, others are quick to find ways to force the aging process, giving their bronze watches the appearance of having spent years on the ocean floor. Much as we’ve talked about many of the beautiful bronze beasts to hit the market in recent years, we’ve yet to delve into what is really entailed when it comes to the day-to-day life of bronze watch ownership.


Montblanc Geosphere 1858 bronze
Montblanc is no stranger to bronze watches, and its latest releases at SIHH in January 2018 included this smart 1858 Geosphere in a dive-style case, alongside a few more bronze additions to the collection.

A Sea of Options 

With the ongoing growth in the category, watch enthusiasts are anything but short on options for bronze watches. Initially, a category reserved for dive watches, the past year has seen bronze (or bronze and steel) offerings surface from Montblanc in the form of the 1858 Automatic, 1858 Automatic Geosphere, and 1858 Chronograph Tachymeter Limited Edition that are anything but dive-ready tool watches. These dressier offerings were a welcome change of pace, especially in the case of the Chronograph Tachymeter – the beloved monopusher chrono powered by Montblanc’s hand-wound Minerva Manufacture Calibre MB M16.29.

The Montblanc 1858 Automatic Chronograph in bronze.

When it comes to bronze divers, the category also continues to grow. After the immense success of the Oris Carl Brashear diver, whose limited production run of only 2,000 pieces sold out well before the year came to a close, Oris unveiled its successor in the form of a diver chronograph this past January worthy of equal levels of praise. Only slightly larger in diameter than its sibling (43 mm instead of 42 mm for the three-hand version), it features the same vintage-style domed sapphire crystal, as well as a handsome one-piece rotating bezel that uses a mix of engraved and relief indexes.

The Oris Carl Brashear Chronograph Limited Edition

On the more obscure end of the spectrum, Mühle Glashütte also opted for bronze to commemorate the 15th anniversary of the brand’s SAR Rescue Timer in 2017. Fitted with a fully luminous dial, and contrasted by its trademark rubberized bezel and a DLC-coated crown, the new model is offered on an olive drab Bund strap and has been limited to a very scarce 150 pieces worldwide.

Panerai PAM00382 - Case CU
Panerai launched its first bronze watch, the Panerai Luminor Submersible 1950 3 Days Automatic Bronzo, as a limited edition in 2011.

Of course, the big news in the category that ruffled a fair number of feathers in the collecting community was the arrival of another Bronzo from Panerai in the form of the PAM 671 Luminor Submersible 1950 3 Days Automatic Bronzo. Panerai’s original Bronzo (the PAM 382) from 2011 and the PAM 507 that followed in 2013 have long been two of most sought-after modern Panerais on the planet, and many Paneristi were once again furious with the brand for launching a third version, thus (in their eyes) making the originals less collectible in the long run. Coming at it from the industry side of the table, in a market as challenging as all the luxury brands have had to navigate in recent years, and considering the success of the first examples, launching the PAM 671 was simply a no-brainer, and being a limited edition model (1,000 pieces), shouldn’t have a truly catastrophic impact on overall collectability.

Panerai: New Luminor Bronzo
The PAM 671 Luminor Submersible 1950 3 Days Automatic Bronzo from 2017.

A Tale of Alloys –
Where Percentages Make All the Difference

While it’s easier to say that “bronze is bronze” in some respects, a quick glance at the wide variety of bronze watches on the market will quickly reveal some significant variance from one model to the next. More often than not, watchmakers are using what is referred to as an aluminum bronze alloy. Now bronze on its own is primarily made of copper, and a wide variety of other metals can be folded into the equation in varying percentages. In most cases, the ingredient added is tin, but arsenic, phosphorus, aluminum, manganese, and silicon can also be used to produce different properties in the material.

Tudor Heritage Black Bay Bronze
Tudor Heritage Black Bay Bronze

In the case of watchmaking, where corrosion and deterioration are concerns, aluminum bronze is most often the weapon of choice, though even within this specific alloy we see some variance. A maximum of 6 percent iron and 6 percent nickel are permitted, however the percentage of aluminum can vary, somewhere in the spectrum of 6-12 percent. Generally speaking, a higher aluminum content presents a slightly cooler gray hue in the bronze whereas a lower percentage allows the warm copper tones to become more prevalent. Looking at the latest swath of releases, we can easily speculate that the Tudor Black Bay Bronze carries a higher percentage of aluminum and other metals, whereas the Oris Carl Brashear Chronograph would be on the lower end of the spectrum. That said, no watch brands at this stage have been willing to release data on what their ideal bronze formula actually is.

This Oris Carl Brashear has seen a variety of forced patina treatments at the hands of its owner Stark Shapleigh, including ammonia fuming and exposure to saltwater.

As many may have noticed, effectively every bronze watch on the market uses a caseback made of either stainless steel, titanium, or in some cases, an exhibition caseback. The need for this is twofold. The copper in the alloy has a tendency to react to the moisture in human skin, creating that green substance on the surface of the metal (copper chloride) and turning both the metal and your skin green. Not only is this less than pleasant from a visual perspective, but prolonged exposure to copper chloride generally isn’t good for your health and is better off avoided when possible.

All text by Justin Mastine-Frost.

You can read Part 2 on how to chemically age your bronze watch here.

You can read Part 3 on how to clean your bronze watch here.


No Responses to “Living With Bronze, Part 1: Choosing the Right Bronze Watch”

Show all responses
  1. Leigh Banbury

    I have just bought a full bronze watch and even the back cover is bronze should i remove the plastic cover covering the back ? I’ve read it’s not good for your health from the green left ?

  2. I believe the patina and case back discoloration is from verdigris, a copper sulfate salt not copper chloride IIRC

  3. Joey Opalka

    One thing that no one is addressing is that fact that white or light colored dress shirts become tarnished from the patina of the bronze metal thus making the shirt appear dirty.

  4. Sylvio F. Bertoli

    Very timely article as there are some real nice bonze time pieces in the market and/or coming on stream. The beauty of a bronze watch is that wearing it is like having a living thing on your wrist. It is a nice experience for a watch aficionado to see the case “maturing” on the account of the patina changing its tone as time goes by. The older the watch the better it looks, especially if you choose the right matching color for the dial. The owner just have to make sure to never polish it. I have a Tudor Bronze Bucherer Blue and I love wearing it.

  5. Edward

    Looking forward to parts two and three. Very very tempted by a bronze Bell & Ross diver. And love the idea of watching it age.

  6. Edward

    Looking forward to parts two and three. Very very tempted by a bronze Bell & Ross diver. And love the idea of watching it age.

  7. Michael

    No mention of the IWC Big Pilot Heritage in bronze? Gorgeous piece!

  8. Boris

    Thanks for this article. Any opinion on the Ingersoll Radiolite? And also any advice on how to take care of the watch ?

  9. Mike S.

    Hello Justin,

    This article is perfect timing. I only wish I could read all 3 parts as I am in the market for a Bronze timepiece and I am headed tomorrow to NYC to shop for one. I put a deposit on the Zenith Pilot Cronometro Tipo CP-2 Flyback Bronze and I am going to finally see it in person before I totally commit. I will admit, I still have my eye on the Zenith Pilot Type 20 Extra Special Bronze and the Tudor BB Bronze.

    I am looking forward to the remainder of your parts.

    Best regards,

Leave a Reply