Hello gtman,
I'll have to ask the question is it the Blue Lawn King ? as that is what it should be. If so the colour is Pacific Blue Hammertone. It's reasonably easy to find as it was a fairly common colour amongst machinery manufacturers back in the 1970's and I've still seen cans of it on the shelf in many hardware chains.
If you can't locate it then the best thing to do is purchase a 0ne litre tin of silver and have it colour matched to the inside of the chain case as that will be the best unfaded sample of the original colour.
As far as the various greens that were used none are recorded on file with any of the paint manufacturers here in Adelaide and no Scott Bonnar records exist as when Rover took over the company in 1980 all the records were destroyed along with a major part of Australia's mowing history.
Cheers,
BB
