Howdy, I believe thats a 11040 model. 8hp, 3 plus reverse gearbox. I've got the remains of one of those here. 4.00 x 8 rear tyres.
The 11046 model was almost identical but fitted with 6.50 x 8 rear tyres and slightly wider rear guards.
The 11050 model had the 5 plus reverse gearbox in the same layout. This model also had wider front tyres. The rear guards were also of a different design.
Cheers
