---
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"
price: "S/.434"
currency: PEN
in_stock: true
reviews_count: 8
url: https://www.desertcart.pe/products/197177774-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band
store_origin: PE
region: Peru
---

# 20mm perfect lug fit 145mm total strap length Pure vulcanized NBR rubber 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

**Price:** S/.434
**Availability:** ✅ In Stock

## Summary

> ⌚ Elevate your Seiko MM300 with the ultimate sporty 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
- **How much does it cost?** S/.434 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/products/197177774-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band)

## 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

- • **Precision Curved End Fit:** Seamlessly integrates with Seiko MM300 models for a flawless, no-gap look.
- • **Premium Vulcanized Rubber:** Durable, oil- and acid-resistant NBR material ensures long-lasting comfort and resilience.
- • **Optimized Strap Dimensions:** 145mm length and tapered thickness (4.5mm to 3.5mm) for a perfect ergonomic fit.
- • **Original Buckle Compatible:** Use your existing tang buckle for a secure, personalized clasp experience.
- • **Sporty & Comfortable Upgrade:** Transforms your watch with a sleek, athletic vibe while enhancing all-day wearability.

## Overview

The Crafter Blue CB03 is a 20mm curved end replacement watch strap crafted from pure vulcanized NBR rubber, designed specifically for Seiko MarineMaster MM300 series. It offers superior durability against oils and acids, a precise fit with no play, and a sporty aesthetic that enhances comfort and style for everyday wear. Buckle not included, compatible with original tang 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 |
|---------------|-------|
| Clasp type | Tang Buckle |
| Item type name | Watch strap |
| Material | Nbr rubber |
| Metal type | No Metal Type |

## 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)

## 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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**Shop now:** [https://www.desertcart.pe/products/197177774-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band](https://www.desertcart.pe/products/197177774-crafter-blue-cb03-20mm-watch-strap-curved-end-rubber-band)

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*Product available on Desertcart Peru*
*Store origin: PE*
*Last updated: 2026-02-05*