TMP61: How to tell pin1 of TMP61 DYA package?

Hi,

my customer has got samples of TMP61 DYA package.

And the silk screen on it is 1GK, then which pin is pin 1?

In datasheet it says pin 1 side has ID area, but we couldn't find any ID.

And the silk screen 1GK covers the whole top side, not half side.