Genuine replacement AP lockheed brake master cylinder for Minis with diagnal split brake systems. These were fitted from 1975 until 1980, however many export markets such as Canadian Minis used it until 1982.
 
Both fittings on this master are 10mm. To fit with your original brake lines you will require two 10mm tube nuts and to reflare your lines.
 
The brake failure switch on this master is not reproduced and thus a blanking bolt has been fitted.