Dokument  Vorgeschlagen von donshottype 
PT Sans  Vorgeschlagen von donshottype 

Looks like this was produced by a rubber stamp that includes a numbering machine with four bands that can be rotated
to show: day, month, and year.

Does not seem to be an exact match for anything in a digital font.

The closest found for the numbers 5, 2 & 6 is Dokument Pro:



Note that THIS IS NOT THE FONT

The numbers 0 & 1 can be approximated by using another font

Not quite as close for the numbers 5, 2 & 6 is PT Sans, a free Google Webfont



Note that THIS IS NOT THE FONT

The numbers 0 & 1 can be approximated by using another font