Small WW2 German police badge

Pictures are a bit fuzzy, sorry !
WWII German badge with a pin back that is guarantee original for the time period.
The pin has a bit of oxidation.
The front shows an eagle with under his claws a banner with 1942.
Someone told me once that it was a small cap badge for the German field police, but I have my doubts about that.
It seems to small to me to be an actual cap badge.

Marked on the back with a “1”

Used condition, or at least it shows it shows that way.