Thanks Eric for your help , i will do some research in the early Ballarat newspapers of the time to find out more.
With reguards to the branding of the engine , and the name Bulldog , versus Ballarat Bulldog, it clearly has Ballarat Bulldog cast into the hopper as a brand name.
My engine looks similar to the cream one in smokestack , but mine has straight flywheels , original carby , and was restored as original .
All the best. Warra Boy