My fascination with these truly Swiss typewriters continues... the more details I discover, the more interesting the story gets. Last year I visited the original PATRIA factory in Pieterlen. This "family" has been researched by Will Davis and was later on covered in ETCetera. I keep discovering foreign variants, for example the French "TYPO" or the English "BYRON" (made in Nottingham, and yet another chapter in the fascinating company history as discussed recently by Richard and Robert - great cross-references, the typosphere is becoming a very useful online compendium of typewriter history). Max Bill, who designed the round second shape of this portable, must have been proud of his highly successful product.