Hello RJK1962

A warm welcome to these forums.

I am yet to write about Qualcasts here, but they have played a significant
part in Australian vintage mower history.

I do not recognise the 'Qualcast PM'; although I do recognise 'Qualcast Power Mower'
If you can upload pictures I will be happy to date the machine for you.

Info on uploading pictures may be found here HERE.

Hope this helps.
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JACK