Ok, slow down here...
1. That badge was used from 1930 to 1948! So the drum -is- from the period advertised. It may not be a drum that was made precisely in 1943, but it's from that era.
2. As it sits, that drum is worth anywhere from US $400. to $600. (giving it a good pricing range.) if it was for sale here in the US.
You are in a country where these drums are even rarer than they are here at home. $400 in US funds is a fair asking price for the drum -here- in the USA. In Austria, it's a stone-cold bargain price. I have no clue why you've hesitated to buy it at such a great local price in favor of having a chin-wag about it with us.
Buy it! It's a BARGAIN considering the rarity of the drum in your home country.
Just my two cents...
John