As the photographs show this is a part-complete motorised conversion of the well-known Airfix Pug.  It has a substantial, and very well constructed, brass chassis of unknown provenance, fitted with a motor that is similar to an ECM, and also a part made Mallard Models etched nickel silver detailing kit, which includes the motion, which has been part-assembled. As you can also see the body has been built very neatly, to a state of near completion, with the moulded handrails removed very cleanly, and holes drilled for the new handrail knobs.

I have applied power to the motor, and it spins the Romford/Markits axle enthusiastically.  Other than the axle, the Romford/Markits wheels have gone AWOL.

The motor is an extremely tight fit through the slot in the underside of the saddle tank that is a little tight, and could do with a touch more filing to open it out a fraction.

Overall, a very nice project, that is not very far from completion, that would be a great little project for a skilled modeller, able to complete it to the same standard that it has been built to thus far, offered at a bargain price.