I would date this one as early 1970's.
Reason being, that Masport bought out Whirlwind in Melbourne in the mid-1970's, and started selling Masport mowers under their own name here, from then on. Vulcan continued to sell rebranded Supa Swifts until the early 1980's IIRC.
From an earlier post of mine:
[quote] Timeframe would have been 1974-75 for the takeover, IIRC.
What makes it stick in my mind, is that Masport then commenced marketing bar blade mowers in Oz, and introduced the 'new model' Iron Horse 2-stroke engine option.
They also required their dealers [we were one] to purchase a new 'special tool' - a crankshaft straightening setup [basically a bench mounted screw press with a runout indicator] at that time. They had it manufactured locally, and the price was pretty reasonable.
This was to straighten bent crankshaft PTO ends, after object strikes with the rigid bar blade, which no other local manufacturer used at that time.
Masport made the product launch for the new Iron Horse a major shivoo for the Vic dealers, at least. It was held at the Southern Cross Hotel in Melbourne, and the dealers and their families were put up there at company expense for the show night! This was a first in the garden machinery game, for those days.[/quote]
