Looks a lot like a Suzo but I agree that it probably isn't one. You can easily identify Suzo sticks by the following text:
STC - Rotterdam (used to be Suzo Trading Company, now Suzo Technology Center or something like that...) and Rotterdam is the city where Suzo was founded.
The microswitch joysticks also have the typical 2/4/8 way restrictor that can be turned to select mode. The one you posted doesn't seem to have it, or is it removed ?
I totally agree with SamShaw about the Suzo 500, and this comes from a microswitch hater

My opinion about Suzo sticks comes from the early 80's when they produced the home version ("The Arcade") of their joystick. It became famous and almost the standard for Atari/Commodore sticks. I still own one of the very early version that was actually a LEAF stick all-round (so including the buttons). That sticks still works like a dream today. They later moved to using microswitches and they were very well-known for the clicky sound (but sill great quality).
Suzo produced only one arcade stick that was even better than the 500, and it was the Suzo Inductive.
No contacts, no moving parts.....arcade heaven IMHO.
Incidently I was at Suzo's head-office a couple of days ago to get some parts. It's amazing how friendly and helpful they are there for a small fish like me
