I gave the Perkeo to myself as an Easter present and my post on it can be seen at http://oztypewriter.blogspot.com/2011/04/perkeo-and-other-folding-portable.html
Georg Sommeregger asked me later about the serial number. I did locate it, rubbed a thin layer of white-out over it (the only time white-out should be allowed anywhere near a typewriter) and made it out as 66176.
The Diamant was made in Frankfurt by Diamant-Schreibmaschinen Frabik and first appeared in 1919. Production continued until 1926, when the three-bank was succeeded by a four-bank version.
In that time, the Diamant decal moved from the frontspiece (as can be seen on an early example, from the Uwe Breker Collection), where it merely added to a striking resemblance to the folding Corona 3, to the paperplate (where it is on mine).
Note too that on my Diamant the letters DIAMANT are embossed around the top of the ribbon spool.
The design of the model name decal also changed, on what I am assuming are later models still. My Diamant has the serial number 4838.
By way of comparison, the Diamant with the new decal which can seen on Arnold Betzwieser’s website has the serial number 8144. This one does not have the embossed letters on the ribbon spool.
I cannot typecast with my Diamant as yet, because although the mainspring and pullcord are fine, I cannot work out how the pullcord attaches to the right hand side of the carriage. I suspect something may be missing. Otherwise, as you can see, the Diamant is in fantastic condition, with not the slightest sign of corrosion anywhere.
Here is the company logo on Arnold's Diamant:
Here is yet another Diamant from the Breker Collection, again without the DIAMANT ribbon spools:
In 1931 Kappel Maschinenfabrik AG of Chemnitz took over the Diamant brand. Three years later, Kappel began to market its own portable typewriters. In 1944, Chemnitz was occupied by the Soviet Union and the factory was closed.Kappel portable typewriters belong to the Olympia family and the likeness between this Kappel Privat and one of the earliest Olympia portables, the Simplex, is only too clear to see. The Olympias were made by Europa Schreibmaschinen AG in Erfurt, part of the AEG Group (of Mignon index typewriter renown).
While the Olympia brand was resurrected after World War II in West Germany, it might be possible to draw a line between Kappel and the East German side of Europa, the Optima typewriters made by Robotron in Dresden.