Of my Triumph and Adler portables only one is missing the model name badge, and it looks to be a brittle glue issue. Just based on the machines I own, models with missing badges are more-or-less equal across all  brands, with the exception of one: Commodore seems to be notorious for losing its badges.

Pete E. wrote:

For a while, I was thinking all the missing Triumph typewriter badges were going to motorcycle club members.  But since thy were re-badged Adler machines...maybe a glue thing, after all.

I think it's actually the other way around. Adler mainly produced standard typewriters until its forced merger with Triumph by Grundig in 1958 that formed Triumph-Adler Büromaschinen Vertriebs GmbH. The only pre-merger Adler portable that I can immediately think of is the Privat (below). I think you'll find that Adler portables really only appeared on mass after 1958, and models such as the Adler Primus referenced by the OP is actually a rebadged Triumph Norm/Perfeckt.

I recall reading somewhere - hopefully a more reliable source than the internet - that Triumph-branded models were not marketed in the U.S. and it was only the Adler name that was used for that market.

Triumph-Adler (T-A) was taken over by Litton Industries in 1969(?), and at the time it was the fifth largest office machine company in the world.  The company was actually owned later on for a short while by Volkswagen.

Correction: I mean paper table in al cases.