It's a Mitchell 300 Pro reel. I was looking at them at Canadian Tire today.
The original 300 was expensive when I was a kid. I saved up and bought my first one in 1966 or 1967. Seems to me it was $18 or $20, which was outrageously expensive. My dad told me that if I saved up half, he would kick in the rest.
At any rate, the price hasn't risen much in all that time. Crappy Tire wanted $99.99, but I got it for $73.26 from amazon and free shipping . With GST, $82.78, so I saved $30 not buying it at CTC. I got a new Ugly Stik that it will go on.
My grandson and I were in the workshop and he was digging around in my fishing stuff. This is what he found. It is a receipt from Wholesale Sports in 2010 for a Mitchell Avocet reel. I still have it. I bought it as a loaner that I kept in the truck when we went hunting. These days, the grandkids use it.