Why do some golf balls have a small letter in some of the dimples?

I've noticed that some brands of golf balls have a very small letter moulded into several of the dimples. Is this some security or authentication feature?Why do some golf balls have a small letter in some of the dimples?Its a manufacturing mark, typically a date code.Why do some golf balls have a small letter in some of the dimples?Its either part of the logo or part of the manufacturing.Why do some golf balls have a small letter in some of the dimples?manufacturing stamp, some companies have more than one factory.

Its kind of like the letters on coins, telling you where they were minted.

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