Your set is a mid 1940's to mid 1950's Roxy set ..The T-rods and claws on bass drum,the tom mount and the wing nuts on the mounts and the finish all point to Roxy..Roxy drums are made in Germany..I can not recall the finish but years ago i have a bass drum in the same finish but is was black with silver lines....Mikey
not quite Mikey and George. Roxy was not exactly the export brand of Tromsa. It was a factory badge put on for an exporter of musical instruments, by the name of Rudolf Linnek. He had a complete line of musical instruments shipped primarily to North America, working out of a warehouse in Wandsbeck a suburb of Hamburg. There were guitars, organs,trumpets,drums,banjos,accordians(these I have seen) and probably lots of other stuff. They were made in various countries. It was a good gig for Tromsa because ,they did not export much and they were happy to sell drums for that purpose. Other brands that I have seen on Tromsa drums are,Hohner,Sonor(they made some marching drums for Sonor for a while),Concorde(Holland),Kings(Holland),Korri,Luxor,Artist,Voss,Vox and Lindberg.Only the Lindberg, Kings and Concorde appear to have been altered in any way from the stock Tromsa drums.
Deri was a separate company altogether.Into the 1960's, Deri was a composite name composed of the first two letters of the two owners names, hence the ri represented Rimmel, which the company became,in the early 60's after the other owner(whose name I cannot remember at the moment) died.
The drumkit pictured is most likely a Lindberg kit. Lindberg was a German music company,that dabbled in musical instrument marketing as well as music publishing(not sure if they are still going). Lindberg had Tromsa make a line of drums for them in the 40's and 50's but although they had Tromsa shells(I have one ,and the serial # is prefaced with Lind), they had very Deri like hardware.Lindberg,may have been a Tromsa -Deri hybrid. It gets complicated here because at some time in the 50's(I'm not sure when) Deri had a state ot the art foundry and apparently made the metal parts for most if not all of the West German drum companies. This is why there was a preoccupation in Germany in the 50's for cast aluminum parts with direct nickel plating. The Tromsa,Deri,Trixon,Lindberg hoops at the least ,made in the late 40's to early 50's are all identical-----cast aluminum with nickel plate.For some reason I can't get the catalogue link to take but here is an old 50's Lindberg catalogue----although there are not identical models pictured here, you can definitely see the similarity in lugs,tom holders,claws seem the same but the T-rods are a little different. I received a box of old nickel parts from Germany a while ago and both of those t-rod styles were in the box.
http://home .arcor.de/pfaue/tromsa/katalog/kata5/kata.htm