series number omega speed master

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Dear all
Need your advice , i just change from the original metal bracelet to a leather strap . I found out that the last number 7 (see picture) is almost disapear . Is this normal ?

The model is 3570 5000

Let me.know thanks
 
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Many Rolexes where the serial and reference are engraved between the lugs have it damaged to badly its unreadable due to the end links rubbing so I wouldn't be surprised by this at all.