Stepper motor from Unimatic Engineering LTD
The label around the side reads :
"Unimatic Engineering LTD
Granville Road Works London NW2 2LN
Sigma instruments, INC
I couldn't find the wiring scheme for this stepper motor anywhere on the web, so I found the wiring by testing and trial and error. To save someone else having to spend time re-inventing the wheel, here's the wiring colours for a unipolar setup.
I wired mine up as unipolar with colours as follows :