Protek SERIES 4000 Carbon Composite 45mm Watches
The ProTek 4000 Series expands ProTek’s rugged dive watch family with an aggressive, performance-first design that pushes durability and visibility to new heights. Built on a larger 45 mm carbon composite case with a secure ratcheting dive bezel, these watches are engineered for demanding environments, from deep dives to tactical missions and everyday all-terrain use. Like all ProTek watches, both series feature the brand’s signature ProGlo™ T100 tritium illumination, delivering bright, self-powered glow for up to 25 years without requiring an external charge.
- 4000 Series – Aggressor Carbon Composite Dive: The core Aggressor platform, combining rugged 45 mm carbon composite cases with Swiss tritium illumination and dependable quartz movements. Designed for divers, adventurers, and anyone who demands tough, high-visibility performance in harsh conditions.
- 4100 Series – Aggressor USMC / Semper Fidelis Editions: Built on the same aggressive platform, the 4100 Series introduces USMC-inspired and commemorative designs, including fully blacked-out stealth models and distinctive digital camouflage dial variants. These special editions bring added heritage and identity to the Aggressor line while maintaining the same professional-grade performance.
Together, the 4000 and 4100 Series bring a bold new size and presence to ProTek’s lineup while preserving the core qualities that define the brand: professional durability, 300-meter water resistance, and unmatched low-light readability. Whether you’re heading into the depths or choosing a mission-ready statement piece, the Aggressor platform is built to perform.
Let customers speak for us
I love this watch. I am a international Flight Attendant and love the duel time,plus the size of the face...
Love the watch, the T100 tritium tubes are very bright. I have a LumiNox with T25 tubes and the Isobrite is MUCH brighter. It’s keeping great time. The only thing I don’t like about it is the band. I have a small wrist so I had to add another hole to make it snug enough. Great watch overall.
Tough, but strikingly handsome. Almost indestructible.
Beautiful watch, exactly what I wanted at a good price!
I bought this for my husband as a birthday gift & he loves it. He is wearing it everyday.
High specs watch (chronograph, sapphire crystal, tritium lume, 200m water resistant, carbon case) at a discount price—awesome watch!! And, the customer service is top notch…I had a question about the timing of the delivery, called the number on the Gem of the Day web site, and spoke to a Mr. Keller—he was pleasant and answered my questions. This is rare in the age of AI service bots. Highly recommend the watch and the company!!
Very light and comfortable. Bracelet is lightweight but not jangly. The second hand hits the markers nearly perfect, as well, which was a pleasant and welcome surprise. And of course the tritium "like" is very nice and bright when at night. I'm going to use this as my "at home" watch after work for this reason!
Bob Keller did the most fantastic job making my 1 oz liberty coin into a pendant for my daughter for her birthday. She is obsessed with it. He was very professional and finished it on time.
My First Impression Of My Ring Was “WOW” So Stunningly Beautiful. Thank You Bob So Much And Your Wonderful Jewelry Business Gems of The Day Anyone Looking To Buy a piece Of Jewelry Look No Futher Gems Of The Day is Your Store Such Quality Jewelry From Reputable Honest Folks Like Years Ago When A Hand Shake Meant Something Very ‘Very Refreshing To Do Business With Gems Of The Day Thank You Bob God Bless T. L.S.
This new Protek is amazing. The fit and finish are superb, Tritium is very bright and the orange color is fantastic !!
Great Service
Ordered from their website after looking for the ring I wanted and their price was half the price it was everywhere else and they said they had it in my size which is a 10 and everyone else only had 9&11s. It took about 2 months to get the ring because back to the sizing when they received the ring it was an 11 and they had a modify it to be a 10 so that took some time so I start to get skeptical and thought maybe it was a scam but Bob kept me in the loop the whole time and explained the situation was super respectful and offered a refund if I wanted it luckily I'm stuck it out because the ring is awesome and fits perfectly.
Great ring for my wife. She was very happy. Great place to do business. communicative and personal. Thanks as always Mr. Keller!
