[suum cuique]

in my opinion it makes no sense to use a piece of paper with an eagle as a receipt or service/repair tag. This looks way too "offical"... But most disturbing is the way how the number 59 was written. It is unlikely that somebody in the 1940's wrote especially the "9" that way. If you read old German letters or documents, I'm sure, you would never find a "9" like this. This "9" on this tag was written like an upside down "6". In Germany, they write the 9 in another way: First they make a small circle, counter-clockwise, then they write the "tail" downward. You can clearly see, that the ink pen was placed at about "3 o'clock" of the circle, then turned clockwise around and then downwards. (Ink spot) The "signature" looks like the initials NW.
I guess it's a fake.