Thanks for joining in and for all the excellent guesses - it’s been a bit of a journey of discovery for me as well, as these Addiator pencils only came back to my attention because of an earlier post on this forum. As for the maker of the Addiator slider pencil with the 2.2 mm lead, I will need to write a short post on how this all fits into the wider Sparstift story.
@Gunther I’m glad you also appreciate the lettering on the Penkala stylus, it has a real Jugendstil/Vienna Secession look to it. I’m sure it must be based on an early 1900s typeface - I will try to look it up when I have the time.