I came across this interesting mower a while back. After I arrived back home with it I did a search on ODK forums and there was the very informative post by Cyber Jack.
The mower looks very original apart from a muffler extension someone added. The catcher is of course missing after all these years as the fabric would not last long.
That's a great find and reassuring that another Collect-O-Matic is saved. These mowers first brought the high-arch design to AUS rotaries. These mowers remain undervalued for their design importance.
May we have an image of the serial number. This will add to provenance for future interest.