Following on from my last post, here's the rest of the non-Brit bike manufacturers:
Jawa 350 (probably modified from this)

- Jawa 350 type 575 1963.jpg (51.88 KiB) Viewed 7134 times
Kreidler 50 (hard to take these seriously, but that's what they rode in trials)

- Kreidler 50 pre65.jpg (30.43 KiB) Viewed 7137 times
Maico (there were quite a few Maicos of various sizes - 150, 175, 250 - in German & Swiss events)

- Maico Trials.jpg (60.57 KiB) Viewed 7137 times
Montesa - converted Impala's

- Impala Trial.jpg (125.55 KiB) Viewed 7134 times
Morini (Roger Decoster competed very successfully on one)

- Moto_morini trial_boniburini.jpg (164.94 KiB) Viewed 7137 times
Motobecane

- motobecane trials, french.jpg (43.2 KiB) Viewed 7137 times
Novy (Belgian made). Couldn't find a pic in trials trim

- Novy_1955_St_Kruis.jpg (126.31 KiB) Viewed 7137 times
Puch. Couldn't find a pic in trials trim from the era

- Puch250cc MC, 1957.jpg (116.62 KiB) Viewed 7137 times
TWN

- TWN Cornet trial 2.jpg (38.88 KiB) Viewed 7137 times
Zundapp - the actual bike ridden back in the day by multi-national champ (Germany)

- Zundapp Trials, Gunther Sengfelders original.jpg (64.62 KiB) Viewed 7137 times
Thats the last of them - 18 different non-Brit manufacturers showing up in National & International observed trials results back in the day (1962-64) that I found in a quick search (no doubt there were more):
Bultaco, CZ, Derbi, DKW, Gilera, Hercules, Horex, Husqvarna, Jawa, Krediler, Maico, Montesa, Morini, Motobecanne, Novy, Puch, TWN & Zundapp