I was going to ask if you had some photos but it appears the photo was larger than the specified file size.
Where did you get the Uni Horse from? Was it from an auction site or a local sale? It may be that the tractor was owned by someone that a club member knows.
There is some information in the book ‘Seventy Years of Garden Machinery’.
Also do you know which engine your tractor has and also which model the tractor is?