Date inside a Star of David

This is the first Star of David I stumbled upon which has a date in its
hexagonal frame. It makes me think about decorating my Emails' date with this kind of design.
Picture is courtesy of Nerissa Atkinson who wrote to me: 

it was taken in the old Jewish quarter of Krakow Poland, in the same street as the old synagogue - I don't really know much more about it than that, but there were a couple on the wall in the same street