I have 3 cans of unique that’s in the same cans as yours, I just empted one last week and will be opening one of them this weekend.
All of these were purchased in the mid 80’s that I can remember.
One thing to do before you use them, take a good whiff of what is in the can. If you get a real odd strong smell then dump it in the garden. But if it’s been sealed I would use it.
"The difference between stupidity and genius is that genius has its limits" Albert Einstine