That usually seems to get people's interest.....
On Saturday, I picked up the pump....thing.....from a retired workmate. (on previous weeks I have picked up two early 30's Bedfords)
He said it's a vacuum pump (I presume from a dairy) and that it came from Dalby. He's had it for years.
It has the general / vague appearance of the Ridd pump in another thread, but has significant differences and no identification of any type that I can find.
Over to the knowledgable ones.....
Jarrod.