Blue Cavern

I am curious to know if anyone records the date stamp (clock marking) on smurfs? The date stamp has been on the smurfs since the end of 2009.

If so how do you do this, as I have tried to using a magnifying glass, taking a photo and zooming really close into the marking though so far I have had no luck.

Any suggestions would be much appreciated

I haven't bothered with recording what is on the date stamp to be honest.