Omega Seamaster Tri-Metal Reference Guide

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Cookies' review of the Omega Seamaster Diver 300M 25th Anniversary 'Tri-Metal' offers a deep dive into a unique reference that, despite its distinctive material composition, remained under the radar for many collectors. His personal journey to acquire this watch, combined with detailed observations, provides invaluable insights for those considering this unusual timepiece. This article highlights why this particular Seamaster, with its blend of titanium, tantalum, and Sedna gold, deserves a closer look.

Here’s a short review of this unusual piece that pique my interest 3 years ago. I had made many calls to enquire about it, but the price was never right.

And then the moment came - I was searching for a brand new Blancpain FF Bathyscaphe in titanium but it went out of production. A casual chat with the AD brought up Omega, and I told her I regret not getting the trimetal Seamaster.

“We actually still have it…let me see what the best price is for you.” The price was finally right. My heart lept.

More hallmarks

“Titanium” engraved on the lugs

More engravings on the bracelet

Notice the “Tantalum” engraving on the side of the bezel.

Something about the fonts used for the words Titanium and Tantalum, remind me of a Genta font. I’m not a graphics designer, but I’m sure I’ve seen this font somewhere before.

The grade 2 titanium is rather dark in colour. It becomes darker when the watch is wet. It is a titanium watch, with touches of Sedna Gold and Tantalum, with muted earthy tones. The tantalum looks purplish blue occasionally.

Other than wearing it on the bracelet, a black strap or grey strap will work. I don’t think other colours will be good matches. There is a grey leather strap and titanium buckle which can be ordered for this from Omega. I opted for 2 additional rubber straps (short and long). The short strap is comfy for daily use, but will not wrap around a thick wetsuit, and therefore a long strap should be used.

It’s quite light, significantly lighter than a 41mm blackbay. This confers much comfort for swimming. It is hardly noticeable when swimming freestyle. A 42mm piece, it wears smaller than it’s published size, perhaps due to the relatively moderate thickness. It is balanced on the bracelet and not top-heavy.

The lume is thick and generous. The minute hand glows in a green hue. The lume is very bright.

On the box, writes 25th Anniversary. It is a limited series of 2500 pieces. This piece did not sell well. It has been 3 years since release, and I have not noticed any other forum member with this (I searched the forum admittedly). I believe it is still readily available.

Thanks for reading. Have a great Sunday.

Key Points from the Discussion

The unique combination of titanium, tantalum, and Sedna gold gives the Seamaster a distinctive aesthetic, with the tantalum occasionally appearing purplish-blue, reminiscent of the Audemars Piguet Royal Oak QE II.
Despite its 42mm case size, the watch wears smaller due to its moderate thickness and is significantly lighter than comparable dive watches, enhancing comfort for daily wear and swimming.
The watch's limited availability and under-the-radar status, even three years after its release, suggest it offers strong value for money compared to other similarly priced luxury watches.
The 'Tri-Metal' Seamaster comes in a robust, heavy metal box, a detail that surprised the author, who expected plastic components for the opening mechanism.
While the bracelet is highly favored, the watch also pairs well with black or grey straps, with Omega offering a dedicated grey leather strap and titanium buckle.
The chronograph version of the 'Tri-Metal' Seamaster, while larger, features pushers that can be operated underwater, a notable technical detail.

The Discussion

Lankysudanese

Sep 5, 2021

These new seamaster offerings are amazing. I’m eyeing one that is nicknamed the dark side of the sea, but your version has the perfect mix of luxury and robustness 👌🏿 Thanks for sharing Hussam

Jp75

Sep 5, 2021

First of all, thank you for the detailed review. Great insights into the watch, your wearing experience. super reading - thanks for that. I like this version, the grey-Sedna-tantalum combo. It reminds me a little of the AP RO QE version. Also the textured dial is beautiful too and makes the dial pop! Please do post more pictures, especially in rubber or NATO strap - there are surprisingly few pictures of this beauty, would love to see more! Wear it in beat of health, Jérôme

Sep 5, 2021

I will post more pics. Was just cutting grass today with the lawnmower and was wearing it. Yes I agree with you. This piece is surprisingly undocumented although it presents value-for-money compared to similar priced pieces. As you can see my fingers are green with grass

Sep 5, 2021

Thanks Hussam and have a great weekend ahead.=D

Jp75

Sep 5, 2021

Was looking at your picture in greater details : is that the only SMP with NO DATE? That would make it very special indeed😀

Sep 5, 2021

Very little tantalum on it. It is only on base of bezel, and the centrelinks of the bracelet. Would wish they made the dial with tantalum.=D

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