Where can I find a replacement strap for the watch?

They are here

Good Price Leather Wristwatch Strap DZ1320_K0037982

Kxmas https://www.kxmas.com > products > good-price-leath...

Top Designer Rubber Watch Band Replacement MK8040_K0009966. $23.28 Regular price $34.24 On Sale.
US$24.79 · ‎In stock

https://www.google.com/search?q=diesel+dz1320+watch+strap+replacement

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Question edited for clarity.

Replacement Watch Bands & Straps

Timex https://www.timex.ca > browse > replacement-straps

Replacement 18mm Resin Strap for Ironman® Essential 10 Full-Size. C$ 15.99. Strap Only StrapOnly. Replacement 20mm Bracelet for Highland Street Gray large.

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  Replacement 20mm Resin Strap for IRONMAN Classic 30 ...

  https://www.timex.ca > Replacement-20mm-Resin-Stra...
  
  Replacement 12mm Resin Strap for Ironman Essential 10 Mid-Size. C$15.99 ... I had to have a jeweler mill down some of the plastic so the band would fit.
  "); background-repeat: repeat-x; display: inline-block; overflow: hidden; position: relative; background-size: 14px 11.4px; height: 11.4px; width: 68px;">"); background-repeat: repeat-x; display: block; background-size: 14px 11.4px; height: 11.4px; width: 42px;"> Rating: 3.1 · ‎8 reviews

Timex Ironman Watch Bands Replacement

Amazon.com https://www.amazon.com > timex-ironman-watch-ban...
5pcs Compatible with Timex Ironman Classic 30 Watch,Ironman Essential 10 Mid-Size Watch Replacement Silicone Band Holder Loops with a Tool to Remove The ...

Replacement Straps for TIMEX IRONMAN Watches

Timex https://www.timex.com > browse > ironman-replaceme...
Replacement 15mm Silicone Strap for Ironman Essential 30 Gray large ... Replacement 18mm Resin Strap Watch for Ironman 100 Lap Modular Black large.

Timex Ironman Watch Bands

Total Watch Repair https://www.totalwatchrepair.com > collections > timex...
Total Watch Repair sells Timex Ironman Watch Bands and Replacement Straps online. ... Timex Ironman Indiglo Triathlon Shock Black 18mm Rubber Watch Band.

Timex Resin Wristwatch Bands for sale

eBay https://www.ebay.ca > ... > Wristwatch Bands

44 Results ; 14mm Timex Ironman 30 Lap Navy Blue Ladies Replacement Watch Band TX754261T. C $20.28. C $48.76 shipping ; 15mm Timex Ironman Triathlon Blk/Orange ...
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Hi,
We are official Diesel distribuitor, we can get you any replacement for your Diesel Watch.
Contact us and we will provide your strap.

Regards.

Diesel Watches

You probably will have to send it away to get sorted (make sure you send it insured and very well protected).
You should contact cerruti to see who the repair shop is in the UK, (not sure they have one.)
Failing that you may be able to buy a replacement strap of ebay and have a general watch shop change strap for you.
Or find a jewellers that sell straps, they should have one that fits.

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thanks

Many stores such as Wal-Mart, Target, etc. sell replacement watch straps in their jewelry department. They may even replace it for you. Also many jewelers will have replacement straps and will install it for you. It looks like this watch has a very wide strap, so if you can't find exactly what you need, you may have to contact the watch manufacturer directly. Google Diesel watches.

I'm having the same problem with the same model. Were you able to find a replacement strap? Thank you.

good day,
hope this link below will solve your problem.

watches