Crafter Blue continues to provide high quality products and this time they released a highly anticipated rubber strap designed to fit the famous Seiko Marinemaster 300. Is it really an ultimate diver strap? Hopefully this review will answer that question.

It’s already a second time I have a chance to review products from Crafter Blue. First time around, I reviewed their Universal Rubber strap and I have to say it is a hell of strap. Its high quality, a stainless steel keeper and a great design made this strap one of my favorite choices for everyday use. When I found out that Crafter Blue is releasing a dedicated strap for one of my favorite watches of all time, Seiko Marinemaster, I knew I had to try it out. And I did!

This latest release from Crafter Blue has a symbol CB03 and comes in three different colors to choose from: Black, Orange, and Brown. Similarly to the previous strap I had a chance to review, CB03 comes in a sealed packet with a picture of a diver on it. I really like this packaging, it’s very simple yet original.

The first thing you will notice when you unbox your new Crafter Blue rubber strap it’s the fact there is no buckle, it’s just the strap! But don’t worry, if you have your Seiko Marinemaster with the original stainless steel bracelet, you are covered. Crafter Blue CB03 was designed to integrate completely with your watch. Therefore, you will use your original MM300 clasp to fit it with Crafter Blue strap. It’s a really simple task, as the clasp on Marinemaster is fitted with pins and all you have to do is push them out and attach the clasp to the strap. It took me about 3 minutes to do so. Ok, but how do you adjust the length of the strap then? If you have ever encountered integrated rubber straps (think of a Sinn rubber strap) you will know what to do. CB03 comes with two parts, the shorter is 62.5 mm and the longer has 100 mm. The longer part is built of several segments, which you can cut off to adjust the total length. But be cautious while doing so! Cut these segments one by one because there is no coming back if you cut too much. Overall, this is a great system which allows you to adjust the strap length to your needs, which can be further enhanced by diver’s extension on MM300’s clasp. However, I have one complaint here. These segments are located only on the longer part of the strap, which means it’s harder to adjust the length in such a way that your clasp sits in the middle of your wrist. If you have smaller wrists, it will be easier for you because you will have to cut off more segments to get a good fit. However, I have 7.5 inch wrist and for me the clasp sits more on the side of my wrist rather than in the middle. It’s not that big of a deal but I feel it’s worth pointing out.  The easy fix for that would be to add some segments to the shorter part of the strap as well to allow a better fit for people with larger wrists as me. It turns out that I put the the parts of the strap in a wrong order. The shorter part of the strap should be attached at 6 o’clock to the case and the longer part at 12 o’clock – the other way round as you attach your normal straps. As a result, the clasp sits on the center of my wrist as it should!

Crafter Blue CB03 being a dedicated strap for Seiko MM300 has a curved ends to seamlessly fit the case of your watch. And indeed it’s a great fit, everything just matches perfectly and you can feel the quality here. The strap also uses Seiko fat springbars so you don’t have to worry about that.

Once you adjust the length of your strap and mount it to the watch, the magic happens. Crafter Blue did not lie here, it’s simply an ultimate diver strap for Seiko Marinemaster 300. It feels great on the wrist, it’s soft but not too soft. Keep in mind that Crafter Blue uses pure vulcanized rubber for their strap and you can really feel that you have a high quality product here. There is mild rubber scent to it as well. Esthetically it also looks fantastic. It feels like these two belongs together. To simply put it, I cannot think of any other rubber strap I would like to put on my Seiko Marinemaster more than Crafter Blue CB03.

If I got your interest, you can order a Crafter Blue strap for your MM300 here for $63.75. In the moment this review is posted, the first batch of Crafter Blue CB03 is already gone. The second batch should be available later in September 2016 so be sure to keep an eye on both Crafter Blue webiste and my blog to get notified.

My personal thanks to Steve from Crafter Blue for providing the strap for review!

8.0 Great

Crafter Blue CB03 being a dedicated strap for Seiko MM300 has a curved ends to seamlessly fit the case of your watch. And indeed it’s a great fit, everything just matches perfectly and you can feel the quality here. The strap also uses Seiko fat springbars so you don’t have to worry about that.

  • Design 9
  • Quality 8
  • Value 7
  • User Ratings (35 Votes) 4.2
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About Author

Watch enthusiast who loves to take photos of his watches, blogger, and founder of Lug2Lug.