What does “be written all over face” mean?

to be very obvious to other people from the expression on sb's face

How is “be written all over face” used?

In The Life and Death of Colonel Blimp (1943), one line is: “I thought it was written all over my face when I left Berlin in '02.”

The clip at the top of this page is from The Life and Death of Colonel Blimp (1943).

I thought it was written all over my face when I left Berlin in '02.

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