A current thread about this stamp has reminded me that I have this sheet of 50 which I was told were printers waste.
They have selvage all around (sorry can't get it all on my printer) are ungummed and have a black 'cancel' smeared on them (by
CanadaPost, so I was told) to make them unusable.

As I don't collect Canada this 'new', and have no way to store these so they don't get damaged, I'm offering them free to the first person who can answer this philatelic trivia question.
Define Sexagenary?The first to answer this can have these merely for the price of postage to your door.