I think some of the models I got when I was real young in the early 60s were the Lesney brand.
I remember before I was a young teen some magazine had an article about a man who was placed in the Guinness Book of World Records as having the largest collection of Matchbox cars so I went and counted mine and had over 300 more than he. The guy was a piker compared to me but I was only about 11 years old and my parents would never have let me contact the Guinness people as they didn't think much for people who bragged or tried for fame (something to which I agree).
You may have some “nuggets” mixed in among the rest. The Lesney ones will have the name molded right into them. But you already knew that. Good luck.