This tuba begs me to do some digging. The only other Reichel I've seen that has a good picture is on the Brass and Pipes blog.
This kaiser is different in just about every way (I mean, beyond being a kaiser contrabass instead of a dainty little 4-valve F tuba). The solder-ons are diamond-shaped on the F, and round on this one. The bows are squared off on the F and circular on this kaiser. The 45-degree entry and exit from the valves were pretty common up until the 60's, I guess, but they are vertical on the F.
Hornucopia shows a couple of Reichel's but without detailed photos.
https://www.horn-u-copia.net/show.php?s ... eichel+%22
Notice the lovely wire-type S-links on the F. Of course, the linkages have been replaced on the kaiser. But both have wide finger buttons that I don't usually see on East German instruments older than the 70's or so.
Most interestingly to me, the F has classic B&S braces from the 60's and maybe early 70's--wire bases filed to a point and machined spindles with a double-ended taper and a groove in the middle where the fat ends meet. This F tuba was overhauled in the 90's, so maybe that stuff was replaced then, but I rather suspect (read: guess, because I certainly didn't don't have a source) that by the 50's, Reichel had been absorbed into VEB Sachsiche Musikinstrumentenfabrik, the general Saxony-area state-owned conglomerate.
Apparently, the last Reichel passed away in 1962, and B&P reports (citing the museum in Markneukirchen as a source) that he was "the last owner". But what did ownership mean in East Germany in the 50's? Certainly, by the early 50's, most of the old Markneukirchen and Klingenthal companies had been rolled up into VEB Sachsiche Musikinstrumentenfabrik, which was later known simply as VEB. "VEB" is just East German for "the people's enterprise" in Communist lingo, and means roughly the same thing as "corporation" in the West except that it is state-owned (given that the "people" weren't really allowed to own much of anything in the "means of production" category). So, I'm supposing that instruments made in the early 50's and labeled "VEB" were simply left without a brand while the notion of branding was in hiding. The old Hess factory portion of that conglomerate became B&S with its many labels, but those labels didn't appear until the 60's.
Hess was a retailer who started making instruments in the late 30's (which is when they hired away leading instrument makers from other companies, e.g. Andreas Crönlein, previously from Alexander and the reason why instruments such as the B&Setc. 101 and 104 are so Alexander-like). But Reichel had always made brass instruments in Markneukirchen since the late 1800's, and they also traded staff with lots of big-name makers of that era.
But it may also be that by the 50's, the Reichel factory, though part of the VEB conglomerate, was still doing its own thing, but traded parts or worked with other makers in the conglomerate to obtain parts for some instruments. Maybe this kaiser was a standard product in their catalog and didn't need outside parts, but the F pictured above was a special and used a lot of parts acquired from sister factories.
Rick "wondering what the tuba landscape would be like if Germany had never been divided" Denney