The German companies all made traditional drums like this, ----shallow snares ,often used for marching,with floating heads, until quite recently, so there are quite a few around ,in parts of Europe. In order to tune them properly , the heads have to have an equal tensile strength or even better, a heavier bottom than top head , otherwise the snare head will overtension. This wasn't much of a problem , until plastic heads came along , with most of these drums being fitted with calfskin anyway, which can be tweaked a little easier but then needing tweaking more often, too. The top only tuners, made a quick tune easy, even while marching and lot of them came fitted with permanent handled T-rods. Many of them had 6 points of adjustment and a simple throw or threaded snare control but this one is fairly top shelf.
With 8 adjusters , a decent parallel drop throw, a brass shell( I am guessing) and those excellent Dresdner style hoops, it might have been targeted more as a mid-range orchestral snare, or possibly one aimed at ease of quick tuning in an out door orchestra venue. You should measure it because it might be 36 cm., possibly even 38.
Certainly best , with calf heads ; I would think, it might be valued at as high as 100 E. , maybe even better.
Another option for this would be to keep your eyes open for 8 double sided tube lugs. Older t-rods( square would be more fitting) probably could be found and so refitted, it would make a super snare drum----and surprisingly , probably would increase it's value.