This is a Oxford Diecast Railway Scale tractor in mint condition  ( see photo ), the box is mint. These vehicles are made to the railway and EFE/OOC/Britbus/CMNL scale of 1/76.

Bertram Mills David Brown tractor, NLP 751 was registered at Mills House in Isleworth, telephone number 4061, and comes in all-over red with contrasting yellow and white lettering. It will stand anywhere on your circus diorama ready to pull whatever you chose.