This listing is for a base illuminator unit that fits into a 39mm sub-stage mount for a C. Baker microscope.  It fits into a recess in the base unit of the microscope condenser or condenser carrier to replace mirror illumination.  It splits into various parts as shown and is missing a cable connector.  The bulb shown is untested and will probably need to be replaced although it looks OK visually. 

In order to fully use this component a cable with connector, new bulb and power source will be required (these are not supplied), therefore this listing is for the plug-in illuminator unit only as shown in the listing photos. 

If there's any questions please just ask seller.

The unit will be well wrapped and shipped by Royal Mail.

Thanks for looking.