Beermaniac; you are partially correct about Tromsa. The earlier Tromsa lugs , like those of, Deri, Sonor, Trixon and Trowa from the same era were cast aluminum and the insert was a simple nut held into a relief , usually by a foam or felt block. So, they didn't have inserts like the familiar ones that are spring loaded but they did have inserts.Tromsa did make a small number of entry level drums, that had the rod thread directly into a cast lug. Later in the 50's , Tromsa, went to stamped brass lugs for about 20 years. These again had a simple nut insert, held in it's relief with a foam block. Tromsa, was a West German company. They were very design independent. The hardware, shells ,throwoffs and mufflers, don't really bear much resemblance to anyone else. About the only close similarity to other drum company's designs are the hoops, that are very similar to Slingerland sticksavers but then Tromsa appears to have been making those since the early 50's and then, the bullet shaped offset lugs, which they were using in the 40's. In the 70's , Tromsa did change their lugs again ,making ones that superficially resembled Slingy lugs but they were much fatter and then later, the made a pointy lug that looked a little Ludwigesque. It is often quoted that small or unknown or East European companies copied the important maker's drums but this is not so true, if you carefully look into the derivation of the designs , the resources available and the market for the drums.
The drum in this thread, appears to be an old Beverley parade snare to me. Beverley used a throwoff, very much like that on their higher end snares, into the 50's.....long and thin, with a longish cast lever, that went in and out and had simple bullet shaped rounded lugs like those. The lugs had spring loaded inserts. They also had a pronounced , thick re-ring( over 1/2"), something that few German drums ever had; Deri and later Sonors being an exception.
