While the Prospex Alpinist series has seen the occasional special edition across the past few years with the Rock Face edition in 2022 and much more recently the Night Sky it has been a long time since the core collection of Alpinist models have been updated. The wait is over with the launch of the new Seiko Prospex Alpinist SPB503, SPB505 and SPB507, featuring refreshed dial features and movement.
Originally designed for Japan’s ‘Yama-otoko’ or ‘mountain men’, the Alpinist has always been a rugged adventure watch since it debuted in 1957, designed to be as reliable as possible in treacherous terrain. Which is why the collection features a durable steel case measuring 39.5mm in diameter with pronounced crown guards and Seiko’s super hard coating to assist with scratch resistance. It also has 200m water resistance to keep it safe from a bit of swimming – presumably in a mountain river or lake rather than the sea.
One of the most distinctive aspects of the case design is the second crown at 4 o’clock, which controls the internal compass scale. A compass scale allows you to keep track of a specific bearing as you walk, using everyone’s favourite piece of watch trivia that you can use your watch as a compass – learn how here. However, all the features we’ve discussed so far are the same as on the previous Alpinist models.
What marks the 2025 collection as new are a few small tweaks to the dial and an upgraded movement. Starting with the dial, the most notable change is the addition of the Alpinist name below the Seiko logo at 12 o’clock, in a retro typography. There’s also a new suite of colours that includes pine green, summit black and teal pine. Though what teal has to do with pine I’m unsure. The black and teal editions are paired with steel tone hour markers while the green has copper tone accents.
For the movement they’ve swapped from the 6R35 to the 6R55. The 6R55 is the more up to date replacement to the 6R35 so it’s a natural evolution – the 6R55 was introduced in 2023 meaning this is the first revamp of the Alpinist since the movement’s launch. It features an extended power reserve of 72-hours versus 70 and while the accuracy on paper is the same, with both movements listed as -15/+25 seconds per day, anecdotally from collectors who have owned both, the 6R55 is the more accurate of the two.
For pricing, the blue and black editions are £880 on steel bracelets while the green, which comes on a leather strap, is £800. That’s a fair jump from the £690 of the previous collection, but between the updated movement and inflation, that’s perhaps not a surprise. It’s just always a little painful to see Seiko move further away from the uber accessible price point they were once known for.
In terms of the new collection itself, it’s not an earth shattering relaunch as it remains largely faithful to the designs that have come before. But sometimes all you want is a nice expression of a good design and that’s what we have here. There’s no need to reinvent the wheel and the Alpinist rolls on perfectly well.
Price and Specs:
More details at Seiko.
These look great, I just wish they’d ditch the cyclops
Completely agree about the cyclops. Also, a display caseback is unnecessary for such an outdoor watch and only makes the watch thicker and a bit more vulnerable.
I see where you are coming from with the case back, but I can also see an argument to have it be a display case back. If people ask me for an entry level watch recommendation, this one has just jumped to the top of my list with the redesign, and I think being able to see the movement is special in your first mechanical watch.