I keep this old muffin tray in the shop to use when I'm sorting small parts. Made by the Supreme Aluminum Industries Ltd. of Scarborough, Ontario. They also made pressure cookers under the "Presto" brand as well as ladders. It looks like Alcan acquired an interest in the company in 1961, and then sold out in 1981. The company vanished soon after, and their trademark was abandoned in 1984.