This button was a promotional item from McClelland and Stewart on the publication of a book on the former Prime Minister of Canada, Pierre Elliot Trudeau. This may have been his Memoirs in 1993. That sort of fits when I was going to book fairs and might have picked it up.
Pretty red rosebud, so symbolic of Trudeau, dominates the pin. Trudeau is Back, McClelland & Stewart, The Canadian Publishers. It is 2.25 inches in diameter and in perfect condition.