Hat is unmarked and is a small size probably a US size 6 & 7/8. This model has rabbit fur interior lining most of the ones that I have seen have a grey fabric lining.
If you like woodwork fresh military items visit my e-bay store and save me as one of your favorite sellers. The item "Original WWII German Army Rabbit Fur Winter Hat" is in sale since Monday, May 20, 2019.
This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\Germany\Patches". The seller is "military_collectors_services" and is located in Webb City, Missouri. This item can be shipped to North, South, or Latin America, all countries in Europe, all countries in continental Asia, Australia.