Xperia M5 Unit Label??

[delixis]

Yesterday, I have got my 3rd New M5 from Sony SC in Thailand.  Yes, my two previous units was experianzing sudden death.  Though, the number 2 has passed the Battery Lock Test.

This time it came only the unit itself without a box. So I have to read the label in the Sim&SD card door which I got its photo here.
Who know the code that I have underline with orange color?  "16W53" which may stand for year of manufacturing as 2016.  But what about W53??

Thank you for any answer..... 

[Uliwooly]

@delixis

It was supposed to be the first two digits year and then week, but week 53? that's odd. 

[delixis]

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@uliwooly wrote:

@delixis

It was supposed to be the first two digits year and then week, but week 53? that's odd. 

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Yes, I think so. It also came from the future, didn't it?