Hello again guys.
As stated above, that leg was a generic unit used by several Australian outboard manufacturers. It's origins may well have been American, but there's nothing to support that at the moment.
To demonstrate the above, would like to point you to an Australian outboard advertised on eBay at the moment. Try searching ATOM Waterboy and you will see see the very same leg on that outboard. That Waterboy is powered by a Hurricane engine, adding further support to the comments I made above. Disregard the price, it's worth nothing like what is being asked. I purchased my last 2 for $70.00.
I also wanted to comment on the lack of serial numbers on the Kirby. This was not uncommon during that era. Fro example every single outboard and engine I have from Boundy Manufacturing (4 in total approx, 6 years apart based on design and ignition components)don't bear serial numbers.
It's been a while since I looked at some of my Hurricane engines, but I don't recall seeing serial numbers on any of those but will check when I get a chance.
Regards
