SKU: 63030844485

Citizen Promaster Mechanical Diver Automatic NB6026-56L Blue Dial Super Titanium Men's Watch

$1779.75 $1977.50
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Description

Citizen Promaster Mechanical Diver Automatic NB6026-56L Blue Dial Super Titanium Men's WatchCapturing the essence of exploration in the air, on land, or at sea, the Promaster line celebrates its 35th anniversary of professional grade adventure with a new limited edition series. This new Promaster Dive Automatic joins the limited edition series, recalling classic Citizen dive aesthetics with modern dive ready technology. The stylish, new diver features a lightweight and scratch resistant Super Titanium case with platinum DLC measuring 41mm,

Capturing the essence of exploration in the air, on land, or at sea, the Promaster line celebrates its 35th anniversary of professional-grade adventure with a new limited edition series. This new Promaster Dive Automatic joins the limited edition series, recalling classic Citizen dive aesthetics with modern dive-ready technology. The stylish, new diver features a lightweight and scratch-resistant Super Titanium™ case with platinum DLC measuring 41mm, with polished and brushed finishing across its facets and a matching triple-link bracelet providing a durable look. The retro design is based on a 1977 Citizen Challenge Diver that was found covered in barnacles and still ticking on an Australian beach in 1983 after being submerged in the ocean for years. That history has inspired the modern Promaster Mechanical Diver and given it the affectionate nickname, Fujitsubo – Japanese for barnacle. The watch's dial and uni-directional bezel feature a marine blue color, with the display making use of embossed hands and a classic green luminous for a vintage feel. The professional-grade timepiece is powered by an advanced automatic movement that boasts enhanced magnetic resistance to protect against interference from everyday devices, as well as a 42-hour power reserve. This high-performance watch comes in an exclusive blue collector’s dive tank box, is ISO compliant and water resistant to 200 meters. Caliber number 9051. Limited to 4,500 unnumbered pieces worldwide.

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SKU: 63030844485

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4.0 ★★★★★
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Mariano
Lowell, US
★★★★★ 5
Great Place to Start
Format: Paperback
Clear and entertaining
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 17, 2026
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Verified Purchase
Austin
Battle Creek, US
★★★★★ 5
Engaging Read for Beginners and Techies Alike
Format: Paperback
An engaging and accessible exploration of how computers really work. The author breaks down complex concepts into simple, relatable explanations, making topics like binary, logic gates, and basic circuits far less intimidating. For newcomers, it’s a great way to build a foundational understanding of computer theory with just a touch of electrical engineering. As someone with a technical background, I still found it entertaining; the examples and analogies added fresh ways to frame ideas I already knew. It’s the kind of book that can bridge the gap between “I use computers” and “I understand what’s happening under the hood.” Highly recommended for anyone curious about what makes hardware and software tick, whether you’re starting from scratch or just want a new perspective.
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Reviewed in the United States on August 19, 2025
P
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Peter
Port Orchard, US
★★★★★ 5
CODE is the book you should get.
Format: Paperback
The best book to enter the field. Grateful that Charles Petzold decided to write it, even happier this was one of the first books I picked up. Recommend to everyone wanting to become a programmer, or just interested in computers.
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Reviewed in the United States on January 12, 2026
M
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Michael Donoghue
Houston, US
★★★★★ 5
If you only buy one technical computer book, this is it
Format: Paperback
Disclaimer: I owned the first edition for years and read it a dozen times, mainly for pleasure since it’s not only informative but also just enjoyable to read. I’m a professional software architect and have dozens of textbooks on computer science and engineering so I’ve been around the block. This is the kind of book I would buy all for all my friends (if I had more than a couple) and family members (if they were even slightly into computers, which they aren’t sadly). Petzold does an exceptional job at describing digital logic and guides you through building a conceptual CPU from very first principles. I think his bottom up approach is the way to go and has helped me understand complex topics in an extremely simple way. When I’m not reading fiction, this is my go to bedtime reading. The second edition has about 100 more pages than the first and some content has been completely reworked and it’s great. If you ever had even a passing interest in knowing how computers work at a very fundamental level, get this book!
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Reviewed in the United States on January 31, 2023
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Yura
Waukegan, US
★★★★★ 4
First programmer?
Format: Paperback
As an ardent reader of the past 1st edition, I was fairly excited to get the latest version. That is, until I encountered the history chapter of the new edition. For one thing, what I do NOT understand in this second edition is the newly added description of August Ada Byron (countless of Lovelace). The author claims it was Babbage who was the first programmer to design the engines, not Ada. I am not trying to start a futile argument here about who has more or fewer contributions, etc. What I am trying to assert here is that it is undisputed that Ada (unless the new evidence arises) left *the very first demonstration* of what this seemingly imaginary machine, which didn't even physically exist, was capable of through her program. Because Babbage designed the engine itself, that doesn't automatically put him in the position of a programmer (despite Babbage being a brilliant engineer/scientist and may have had a simple or detailed program in his mind). However, it was Ada who gave a definite touch to programming concepts that ultimately led to modern-day programming. Ada deserves more recognition than a mere "tutorial writer," and she is certainly entitled to the title she deserves. Other than that, like the previous edition, this book is a must-read for people who are from related/unrelated fields. I always loved the 1st edition, and I would do too with the 2nd. Still, I think history should always be approached with more care, particularly if matters have potential controversies.
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Reviewed in the United States on January 6, 2023

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