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So would that be the date? There was a bit of discussion about dates on my post.

Kye, I'm reasonably confident that the Sabre was introduced in late 1956
for the 1956-57 season (and beyond).

The first Whirlwind domestic rotary dates to 1955.
In this September, 1956 ad the two machines are side-by-side.
I do not understand the two 18" machines. Why two?

Note Whirlwind claim to be first in Australia with a recoil.
The first model (right) is described as "All-purpose".
Perhaps it was more heavy-duty that the domestic Sabre.

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The Sabre was offered in two sizes: 16 & 18.
The 16" had the smaller 3G; the 18 the larger Midget.

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As to the first model Whirlwind ... I have seen a photo
of one. Patrick from Vintage Mowers has one in his collection:-

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Also at Caboolture I saw an interesting J.A.P. engine, it was the same type as the one on the Qualcast, but it had an alloy base plate, which looked like a section of a Qualcast base! I have his number written down if I do want it
I think we would need to see a photo.

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Jack