The quick answer.
Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap is a model-fit watch strap listed at $122.55 after code SEBASTIANBASSOL09 (before code $129). We recommend it for an Omega Seamaster 300 owner who can confirm the exact reference and wants a black FKM strap made to the watch’s attachment and wrist dimensions.
Why it belongs on the shortlist.
The product is more than a generic black strap sold by width. Epoch says it builds the strap for the Seamaster 300 and lets buyers specify lug width, wrist size, stitching and finish. We like that approach when a ready-made strap leaves a gap or an awkward length. The lifetime craftsmanship warranty adds reassurance about construction, while the test on the exact black variant gives a concrete price to weigh before sending custom dimensions.
Fit is the reason to choose Epoch over a generic strap.
Epoch describes the strap as designed for the Omega Seamaster 300 and offers choices for lug width, wrist size and finishing. That can be useful when you want the rubber to follow your watch and wrist rather than settle for a one-length standard band. We would provide the exact reference and measurements and get the final fit confirmed before the maker starts production.
Black FKM keeps the change focused on daily use.
The selected black option pairs a plain dark surface with a silver buckle and the more technical character of rubber. Epoch identifies the material as FKM, which gives buyers a clearer specification than a listing that simply says “rubber.” We would choose it for a sportier, easier-to-clean alternative to leather; the strap does not change the water-resistance rating of the watch itself.
Understand the production and return terms.
The product details state a typical 10-day lead time; the FAQ says standard made-to-order work usually takes 3–7 business days, with more complex builds taking 10–15. Confirm the estimate for your options. Epoch’s policy allows an unused custom strap to be returned within 7 days for a 50% refund of its price, excluding original shipping; worn, bent or marked straps are not refundable. That makes fit confirmation worthwhile before ordering.
The details, at a glance.
- Selected variant
- Black · Shopify variant 44975964389584
- Compatibility
- Designed for Omega Seamaster 300, per Epoch
- Custom fit
- Lug width, wrist size, stitching and finishing options
- Material
- FKM rubber, per Epoch
- Production
- Made to order; lead-time statements differ on the page
- Warranty
- Lifetime craftsmanship warranty, per Epoch
What draws us in
- The page offers lug-width and wrist-size customization for a made-to-order fit
- Black FKM rubber gives a Seamaster a purposeful sport-strap look
- Epoch lists a lifetime craftsmanship warranty
Before you choose
Epoch’s product page calls this a Seamaster 300 fit, but the buyer still selects measurements and a wrist size. “Seamaster 300” and “Seamaster Diver 300M” can describe different watch families; send the complete reference and confirm the buckle and attachment with Epoch. The page gives a typical 10-day lead time in the product details and 3–7 business days for standard made-to-order straps in its FAQ, so ask which estimate applies to your build.
Who it suits.
An Omega Seamaster 300 owner who can confirm the exact reference and wants a black FKM strap made to the watch’s attachment and wrist dimensions.
When to choose something else.
Choose an in-stock standard strap if you are unsure of the model, want a full-refund return window or need a strap immediately.
Warranty, returns and ownership.
Epoch states that unused custom-made straps may be returned within 7 days for a 50% refund of the strap price, excluding original shipping; worn or altered straps are not eligible. The brand lists a lifetime craftsmanship warranty for construction and material integrity. Confirm your watch reference, custom measurements, build lead time and the current policy before submitting the order.
Closest alternatives.
- Wristbuddys FKM Rubber Strap for Omega Seamaster 300 Diver – Black (42 mm, 2018 onward) · $149 listed (2026-10-16): A near-price FKM option at $149 for the specific Omega Seamaster Professional 300 Diver 42 mm from 2018 onward. Wristbuddys lists a curved fit, 20 mm width and included stainless-steel buckle. Choose it only if that exact Diver 300M reference matches your watch; it is not a universal fit for every Seamaster 300.
- Rubber B Black Rubber Alligator Strap for Omega Seamaster 300 Heritage · $300 listed (2026-10-16): A premium $300 alternative for the Seamaster 300 Heritage, made from vulcanized rubber with an alligator-like surface. Rubber B says it is not compatible with the Omega buckle supplied on leather-strap models; its optional 18 mm fine buckle costs extra. Choose it for the Heritage-specific luxury finish, not for value.
Measure the attachment before ordering.
Confirm the full Omega reference, attachment width, buckle type and wrist measurement with Epoch. Do not select from the “Seamaster 300” wording alone; model families use different case and strap interfaces. Check strap fit.
Epoch Straps partner code and offer terms. Our cart test applied SEBASTIANBASSOL09 to this exact variant on October 20, 2026. Use the product link below and confirm the final total; shipping and taxes are not included in the item price shown.
Where to buy.
Specifications and product photography: Epoch Straps product page (checked October 16, 2026). Find Omega Seamaster 300 Black FKM Rubber Strap at Epoch Straps through our partner link and search for the selected option there. How we choose.
A few good questions.
What is the discount code for the Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap?
The Epoch Straps discount code is SEBASTIANBASSOL09 for 5% off at epochstraps.com. In our cart test it lowered this model from $129 to $122.55 before shipping and taxes. Every code and tested price: https://watchritual.com/promo/epoch-straps
Will the Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap fit every Omega Seamaster?
Epoch describes this strap as designed for the Omega Seamaster 300 and asks buyers to provide fit details. Send your complete watch reference, lug width, buckle requirements and wrist measurement for confirmation; Seamaster 300 and Seamaster Diver 300M models are not interchangeable names.
Is the Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap made from FKM?
Yes. Epoch describes the selected black strap as FKM rubber. The material specification comes from the seller; it is not an independent material test.
How long does the Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap take to make?
Epoch’s product details give a typical 10-day lead time. Its FAQ says standard made-to-order straps usually take 3–7 business days and more complex builds can take 10–15, so confirm the estimate for your selected dimensions and finish.
Can I return the Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap?
Epoch allows an unused custom-made strap to be returned within 7 days for a 50% refund of the strap price, excluding original shipping. Worn, bent, creased or marked straps are not refundable.
What does the Epoch Straps Omega Seamaster 300 Black FKM Rubber Strap cost with the Watch Ritual code?
The price before code was $129. In our cart test on October 20, 2026, SEBASTIANBASSOL09 lowered the tested variant to $122.55, saving $6.45 before shipping and taxes. This result applies to this exact item and variant.