The drums are Deri-----from the early to mid-50's.The wrap colour is irrelevant. All companies had access to the same wraps and their offerings often overlapped, so despite the fact that the pictured Trixon drums are the same colour it is meaningless. ----kind of like thinking a Ford is a Chev because they are both cars and are the same colour. Mikey is correct about the arm. That is an old Trixon arm , you are picturing and those are rare too. There are many people with Trixon drums looking for those. The Germans probably invented the L-arm and since then, there has been a version of it applied to every mfg.'s drums. Unfortunately, each company had a different size, although there was sometimes equivalence. Trixon were the largest in Germany at 22mm( just a shade under 7/8"). Tromsa used 20mm ( .8 in.) Sonor had several sizes but the early ones were 19mm( almost dead on 3/4") Trowa/Tacton were odd at 23/32"---actually being an odd metric measure at 18.2mm. Deri, I don't know the size of but having seen some hybrid drums , such as Lindbergs, which seemed to be mostly Tromsa parts with some Deri parts----it looks like the Deri mounts may also be 20mm. Your best bet is to measure the hole accurately-----typically the hole is a mm or so larger than the arm and look out for an arm that will work, that is the next metric size smaller .If they do turn out to be 21mm or so , you can make a standard oriental 3/4" arm work by installing a thin sleeve inside the mount but it's ugly.
I have a matching snare------- 85.00 but I think you have possibly already been informed of that?
p.s.----I just did some more measuring on those arms and both Sonor and Trowa appear to have tapered tubes! The Sonor arm from a teardrop kit has tubes that are 18.92mm at the tip widening to 19.2mm where it overlaps the joint casting.. In the midsection of the knurling they are 19-19.05 mm. The Trowa arm is 17.94 at the tip widening to 18.23 near the joint-----so the Trowa nominal measurement is probably 18mm---which makes sense.
