Hi,
its one of these which is similar to the ones used in the losmandy mounts.
an IIS user has replaced his mounts gearbox with this one.
difference is that the mount uses a worm wheel reduction stage after the gearbox, I'm using timing pulleys.
http://australia.rs-online.com/web/p/gearboxes/0336416/
as per the datasheet, the output torque is 1 Nm.
But there are several similar ones with different ratings, some with meta spur gears.