---
product_id: 197177774
title: "Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc"
brand: "crafter blue"
price: "€ 81.32"
currency: EUR
in_stock: true
reviews_count: 12
category: "Crafter Blue"
url: https://www.desertcart.ie/products/197177774-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band
store_origin: IE
region: Ireland
---

# 20mm lug width perfect fit Adjustable length 145mm total Pure vulcanized rubber, oil & acid resistant Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc

**Brand:** crafter blue
**Price:** € 81.32
**Availability:** ✅ In Stock

## Summary

> ⌚ Elevate your MarineMaster game with the ultimate rubber strap upgrade!

## Quick Answers

- **What is this?** Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc by crafter blue
- **How much does it cost?** € 81.32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ie](https://www.desertcart.ie/products/197177774-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band)

## Best For

- crafter blue enthusiasts

## Why This Product

- Trusted crafter blue brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Customizable Length:** Dual strap lengths (90mm + 55mm) with easy adjustment for perfect wrist fit.
- • **Durable Vulcanized Rubber:** Superior strength and resistance to oils and acids for everyday rugged use.
- • **Comfort Meets Sporty Style:** Thick yet flexible strap transforms your watch into a sleek, sporty statement piece.
- • **Original Buckle Compatible:** Use your existing buckle for a hassle-free upgrade without extra cost.
- • **Precision Fit for Seiko MM300:** Curved end design ensures seamless integration with iconic MarineMaster models.

## Overview

The Crafter Blue CB03 is a 20mm curved end rubber watch strap designed specifically for Seiko MM300 MarineMaster models. Made from pure vulcanized rubber, it offers enhanced durability and resistance to oils and acids, ensuring long-lasting performance. With a total length of 145mm and a thickness tapering from 4.5mm to 3.5mm, it provides a comfortable, sporty fit that perfectly complements your watch’s iconic design. Note: buckle not included, compatible with original buckles.

## Description

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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 |
|---------------|-------|
| ASIN  | B0DM5T1JLM |
| Best Sellers Rank | #1,344,236 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #1,297 in Women's Watch Bands #2,663 in Men's Watch Bands |
| Customer Reviews | 3.7 3.7 out of 5 stars (36) |
| Date First Available  | November 6, 2024 |
| Department  | Unisex Adult |
| Manufacturer  | CRAFTER BLUE |

## Images

![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 1](https://m.media-amazon.com/images/I/51umK-3YAOL.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 2](https://m.media-amazon.com/images/I/51CfBfudfDL.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 3](https://m.media-amazon.com/images/I/51B8cOfq+sL.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 4](https://m.media-amazon.com/images/I/61PabuviG1L.jpg)
![Crafter Blue CB03 20mm Watch Strap Curved End Rubber Band Replacement for Seiko MM300 MarineMaster SBDX001, SBDX003, SBDX005, SBDX017, SBDX021(SLA019J1), SBDX025, SBDX023, SLA023J1(SLA021J1) etc - Image 5](https://m.media-amazon.com/images/I/51sdivktctL.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

### ⭐⭐⭐⭐⭐ Fits perfectly
*by L***N on April 17, 2024*

Quality is good and fits my husbands watch perfectly

## 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

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*Product available on Desertcart Ireland*
*Store origin: IE*
*Last updated: 2026-03-18*