I found some pictures on the net , it's from a store in the Netherlands http://www.nonstopmotoren.com/nl/nonstop-motoren-trialmotoren-ossa-oset
I believe the bike is already sold but i still have the pictures.
Maybe you can contact them.
http://www.tweedehands.nl/fietsen/fietsen/kinderfietsen-jongens/oset-16-36volt-elektrische-trial-172189762.html