What is the value of a Stall and Dean lefthanded catcher's mitt model 7595 or 7535?

I'm not familiar with that particular model. The bulk of the value on a collectible baseball glove/mitt relies on the player endorsement. Without a player endorsement the value will fall onto the age of the glove, and vintage baseball glove features like buckle backs, pillow style mitts, etc. Of cause there are a number of other factors that will determine the value of the glove. Model, Year issued, and the condition is important. Most common flaws with Gloves are: loose or broken lacing/webbing, Dry or cracking leather, ripped Manufacturer label on back, printing on glove worn out, and the person who owned the glove name written on it. If you can send me some pictures of the mitt I might be able to help you out. I will leave a link below to help date your glove.