I used to collect old Anheuser Busch (Budweiser) beer signs, steins, clydesdales and have never seen these. I doubt if any of them are rare as they were given away for several years and they would've likely known a better date and mint mark. There may be collectors who would like to have them with the stickers, but as far as value I don't know. I did see one that was $100 and was on the market for almost 3 years and was unsold. IMO it would be hard to display them in a desirable setting for others to enjoy. I don't believe you can determine the mint marks without removing the stickers and then there's the adhesive to deal with. Unless you're in a hurry to get rid of them I would leave them as they are. Kind of a cool and different find. JMHO
A few days in a soap and water soak has helped the ‘83-O that the sticker fell off of. Still not nearly as clean as I’d like but progress. I’ll play around a few more days with it then back into the acetone.