Which strap size do I need?!

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Hello! Awhile back I bought a beautiful 1958 vintage piece from EFauser. I love this watch and it gets worn quite often. Unfortunately, the leather strap has began to tear, so its time to replace it. Unfortunately, I don't know what size I need! I thought it was a CK 2849 with a Caliber #503. But looking at the photos, I am not sure I am right! Can anyone help me identify this watch so I can get the correct strap! I'm looking for a brown leather!

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Edited:
 
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Measure between the lugs to be 100% sure. Then shop for that size strap in whatever material and color you want.
 
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I have the same reference and can confirm, it's 18mm.
Very nice watch 😉