--- product_id: 197177774 title: "CB03 20mm Watch Strap Rubber Band for Seiko MM300 MarineMaster" price: "€ 132.66" currency: EUR in_stock: true reviews_count: 12 url: https://www.desertcart.hr/products/197177774-cb03-20mm-watch-strap-rubber-band-for-seiko-mm300-marinemaster store_origin: HR region: Croatia --- # 20mm lug width perfect fit 145mm total length, ergonomic sizing Pure vulcanized rubber, ultra durable CB03 20mm Watch Strap Rubber Band for Seiko MM300 MarineMaster **Price:** € 132.66 **Availability:** ✅ In Stock ## Summary > ⌚ Elevate your MarineMaster game with the ultimate rubber strap upgrade! ## Quick Answers - **What is this?** CB03 20mm Watch Strap Rubber Band for Seiko MM300 MarineMaster - **How much does it cost?** € 132.66 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/197177774-cb03-20mm-watch-strap-rubber-band-for-seiko-mm300-marinemaster) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Ergonomic Comfort:** Optimized thickness gradient (4.5mm to 3.5mm) for a sleek yet robust wrist presence. - • **Unmatched Durability:** Crafted from pure vulcanized rubber, offering superior resistance to oils, acids, and daily wear. - • **Original Buckle Ready:** Designed to pair perfectly with your existing buckle, preserving authentic style. - • **Versatile Compatibility:** Fits a wide range of Seiko MarineMaster references, making it the ultimate upgrade strap. - • **Precision Fit for Seiko MM300:** Tailored 20mm curved end design ensures seamless integration with iconic MarineMaster models. ## Overview The Crafter Blue CB03 is a premium 20mm vulcanized rubber watch strap engineered specifically for Seiko MM300 MarineMaster models. Featuring a curved end design for a flawless fit, it boasts superior durability against oils and acids, ergonomic thickness for comfort, and compatibility with multiple MarineMaster references. Note: buckle not included, designed to use your original buckle. ## Description Shop cell phones and accessories at desertcart.com. You'll find great prices on cases, headsets, and the latest smartphones from carriers like Verizon, AT&T, and Sprint Review: Major improvement to an otherwise perfect watch - Switched out the bracelet and haven’t looked back. First off, the watch is way more comfortable with the rubber strap. The straps fitment is spot on - no play at all between the straps fitment and lug. The quality is great - rubber is thick and sturdy but still comfortable for everyday use. The appearance of the watch is what I would call sportier, which I’m keen to. Used the stock mm300 ratcheting clasp with no issues. The 6’oclock side of the rubber strap is fixed you adjust my shortening the 12’oclock strap. For ref my wrist is about 7inches and it fits perfect. Bought Ken for each of my mm300s Review: Ripped at the holes - unfortunately I cut it to size before realizing that 2 of the holes are ripped, so cannot return. Otherwise it seem to be a nice band, just I can’t trust it with the material so brittle at the holes ## Features - CRAFTER BLUE CB03 20mm curved end watch strap replacement watch band for Seiko MM300 - 20mm rubber watch strap compatible with Seiko MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021 (SLA019J1) and SBDX023 (SLA021J1), SBDX025, SLA023J1 - Lug width: 20mm; Buckle size: 18mm; Note: Buckle is NOT included, please use your original buckle. - The NBR CRAFTER BLUE rubber strap is made of pure vulcanized rubber which has superior strength and more resistant than natural rubber to oils and acids - Overall Length: 90mm + 55mm (Strap length:145mm / 5.71"); Thickness: Approx. 4.5mm - 3.5mm; Spring bar hole dia.: 2.50mm ## Technical Specifications | Specification | Value | |---------------|-------| | Clasp type | Tang Buckle | | Item type name | Watch strap | | Material | Nbr rubber | | Metal type | No Metal Type | ## Images ![CB03 20mm Watch Strap Rubber Band for Seiko MM300 MarineMaster - Image 1](https://m.media-amazon.com/images/I/51umK-3YAOL.jpg) ## Available Options This product comes in different **Color** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Major improvement to an otherwise perfect watch *by J***C on January 24, 2026* Switched out the bracelet and haven’t looked back. First off, the watch is way more comfortable with the rubber strap. The straps fitment is spot on - no play at all between the straps fitment and lug. The quality is great - rubber is thick and sturdy but still comfortable for everyday use. The appearance of the watch is what I would call sportier, which I’m keen to. Used the stock mm300 ratcheting clasp with no issues. The 6’oclock side of the rubber strap is fixed you adjust my shortening the 12’oclock strap. For ref my wrist is about 7inches and it fits perfect. Bought Ken for each of my mm300s ### ⭐ Ripped at the holes *by C***B on January 28, 2026* unfortunately I cut it to size before realizing that 2 of the holes are ripped, so cannot return. Otherwise it seem to be a nice band, just I can’t trust it with the material so brittle at the holes ### ⭐⭐⭐⭐⭐ Great strap! Balances the watch very well! *by J***E on July 4, 2022* Love how it fits and makes the watch feel. Takes the top heavy aspect of the marinemaster and makes it very wearable. ## Frequently Bought Together - Crafter Blue CB03 Curved End Watch Band Rubber Strap Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - MiLTAT 18mm Wetsuit Ratchet Buckle Diver Extension Clasp, 316L Stainless Steel Brushed --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/197177774-cb03-20mm-watch-strap-rubber-band-for-seiko-mm300-marinemaster](https://www.desertcart.hr/products/197177774-cb03-20mm-watch-strap-rubber-band-for-seiko-mm300-marinemaster) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-31*