The shop owners' younger brother had been in Europe many years ago, and occasionally sent her boxes filled with a variety of items such as this, plus original propaganda posters, Nazi recruiting posters and flyers, wooden ammo crates, etc. to sell at her antique shop. Judging from several other WWII vintage German items in the shop, I have no reason to believe this is not a genuine article. All she knew was that it was from wartime Germany, nothing else. She's getting down to the last few items that he sent from the sound of it.