As well the pattern was made according to a known original hat. The size is 57 that is about equal to a 7 1/8 US size.
The last 2 pictures show a 56 stamping but you will get a 57. This item is in the category "Collectibles\Militaria\WW II (1939-45)\Reproductions\Germany".
The seller is "vit-zemanek" and is located in this country: CZ. This item can be shipped worldwide.