AnchorFlex™ End-Link for Seiko Prospex SPB453 / SPB451 / SPB455
Machined to the case. Built to stay.
Built for the Integrated Look
Seiko's 1965 Heritage Diver was designed around its bracelet. Put it on a straight-end strap and you see it immediately — daylight between the lugs, a break in the line where the case should carry through.
AnchorFlex closes that gap. Machined end-links curve into the SPB45-series case and pick up exactly where the lugs leave off, delivering the integrated profile of the factory bracelet with the comfort of FKM. No shims, no gap, no compromise.
Compatibility
✔ Seiko Prospex SPB453, SPB451, SPB455
✔ JDM equivalents: SBDC197, SBDC195, SBDC199
✔ Includes machined end-links and Premium 1.8mm spring bars
✘ Not compatible with the previous-generation SPB143 / SPB147 / SPB149
✘ Not compatible with King Seiko SPB457 / SPB459 / SPB461
Both generations get called the "62MAS" — check your reference number before ordering. This end-link is cut for the 2024-onward case only.
Sized for Seiko's Hardware
Prospex divers run oversized lug holes and thicker-than-standard spring bars, which is why so many aftermarket straps sit loose or won't seat at all. Every AnchorFlex fitment for this watch ships with our Premium 1.8mm spring bars, machined to Seiko's actual tolerances rather than a generic 20mm assumption.
Correct at the lug. Correct at the bar. No play.
AnchorFLEX™ FKM Fluoroelastomer
Our signature FKM compound isn't an afterthought—it's the foundation. Purpose-built for daily wear, it resists UV exposure, heat, and chemicals without hardening, fading, or losing its form. The result is a strap that feels broken-in from day one and stays that way.
Soft where it counts. Structured where it matters.
Specifications
| Material | AnchorFLEX™ FKM Fluoroelastomer |
| End-links | Machined, fitted — included |
| Hardware | 316L Stainless Steel Buckle |
| Spring bars | Premium 1.8mm — included |
| Lug width | 20mm |
| Profile | Slim, tapered, all-day wear |
The bottom line: the SPB453 looks its best when the strap finishes the case instead of interrupting it. This is the shortest path to that, straight out of the box.
FAQs
Some end-link installs can feel tight at first because the thickness rubber strap at the end-link is maximized to ensure durability. There are a few ways to get it installed:
First, try gently wiggling and pushing the spring bar through until the spring bar pops into the opposite side of the end link. This can require some effort.
You can also squeeze the rubber portion of the strap into the end link between your thumb and index finger while pushing the spring bar into place. This helps compress the rubber slightly and gives the spring bar more room to seat properly.
If those techniques do not work, our premium 1.7mm spring bars can be used as an alternative. There is no downside to using them, but we recommend trying the first two installation methods first since the standard spring bars usually work once everything is seated correctly.
If you still have trouble, contact us and we can help troubleshoot the install.
AnchorFLEX™ straps are made from premium FKM rubber and have been third-party tested to be free of harmful fluorinated “forever chemicals” within the scope of the testing performed. We do not intentionally add PFAS-based coatings, surface treatments, or chemical finishes to our straps. Because FKM is a fluorinated rubber, we avoid vague blanket claims and clearly disclose the material. Customers who prefer to avoid fluorinated rubber entirely may prefer our nylon, sailcloth, leather, or other non-FKM strap options.
Some of the reviews shown are from related products the merchant grouped with this one.
J
Couldn’t be happier! Perfect fitment with the OEM endlinks and the FKM is super comfortable. Looks even better than the OEM strap. Would love it if they made a version to fit the OEM clasp, but the deployant clasp is top notch anyway.
D
10/10 would recommend. I didn't wanna shell out $700 for a BB54 strap from the AD and this was the perfect option. I like it better design wise as well. Shipping was quick too. We'll see how it holds up.
P
This strap is excellent. The rubber is extremely comfortable and it just looks so good with the integrated end links. I already loved this watch on the OEM mesh bracelet but now that I have this strap, I am not sure I will ever go back to the mesh!
J
Phenomenal strap. End links are super clean. Love how it looks on my SPB511
R
Perfect strap! High quality fits nicely and feels very premium! Very good customer service!
Can’t wait to get the next one
O
Excellent quality rubber strap! It’s soft, comfortable, and feels great on the wrist all day. I would definitely buy another one.
T
Made my Seiko Hdb008 look like a better watch.
M
Everyday strap now!
D
Awesome strap, comfortable, lines up perfectly to the case, would recommend as a great alternative to the oem seamaster fitted rubber strap
A
Perfect strap. Wonderfully supple and looks OEM.
S
The fitment is great and it gives the timepiece a whole new look. Extremely comfortable.
N
I really like this.. wish this has extra hole for my 6.5 inch wrist fit tightly.. or shorter one choice.
B
Great fit to the original end links and looks incredible! Definitely going to be my summer combination!
K
I was surprised how much I ended up loving this strap. The end links fit perfectly, the texture of the rubber looks great and it’s an extremely comfortable strap. I rarely wear any other strap on my SMP 300 anymore. Another benefit of this strap system is that if you buy Anchor’s oyster bracelet for the 41mm Omega Seamaster, you can use it on the 42mm SMP 300 using the 42mm end links. I find it is also better quality than Forstner’s oyster bracelet.
R
Perfect rubber strap for the Seamaster. End links fit perfectly, rubber strap is soft and super comfortable. Watch wears wonderfully. I really like the design of the buckle. It feel very low profile and smooth to the touch on the wrist. If you’re looking for a rubber strap, this is the one.
S
Great strap for my Seamaster! Very comfortable.
j
Fit and finish on the end links and rubber strap for my Tudor Ranger was top notch. Great product and great service from Brando and Anchor Straps. Just picked up some NATO straps and they are awesome as well.
A
This is truly a great strap. Fo me this was the strap Tudor should have provided. Quality and comfort it’s on par with other high end straps like Everest. Fit was perfect and works with the factory buckle as well. I would highly recommend recommended this strap to anyone that love the look but was disappointed in the Tudor strap, define upgrade.
A
I bought a strap for my Tudor Pelagos 39, then decided to get the deployment version right after. I ended up keeping both! The quality and style of these is outstanding! I wish you made straps for Rolex!
S
Great Quality and style !!
V
An excellent strap. The endlinks fit perfectly and give it a luxious look to it. The only critique I have is that the second catcher needs a tab so that it doesn't slide off the extra strap length. If you're thinking about it do it!
W
Really looks good on the blue Tudor Black Bay 54. Fits great and looks OEM
