tomthiel,
If you come across model O1s or O2s, the back panel will say Thiel - manufactured by Conceptions Electronics.
I just checked my pair of 02s and it looks like Thiel outsourced to more than one manufacturer. Mine say on the back, manufactured by:
Heinl Electronics...in Canada.
They remain one of my all time favourite speakers. They were owned by my girlfriend (now wife) and re-introduced me to the virtues of clarity and neutrality, after a number of years of buying big honking speakers suitable for shaking the walls.