The Bell's General Store in downtown Kalamazoo does feature a Growler Station with up to four options.
It could also just be a proof number or something from the manufacturer and mean nothing at all in regards to age. If it’s a style that’s no longer made do a quick Google search to see if you can find out how long it was made for. Another great way to figure out the relative date of your bottle is advertising.Bottle label designs can change over the years and advertising will always depict what the label looked like at that time so consumers could go out and get that exact bottle. if you’re looking for some other great whiskey bottle dating resources give these a peek.You can basically use advertising as a visual history of label changes. Look for any clues on the bottle itself that’ll pin point it. Some bottle codes are easy to decipher while others are not, but if they exist they’re a great place to start.In the image above we see that it’s commemorating the 200th anniversary of Evan Williams and on the bottle they say the distillery was founded in 1783. If you can’t decipher them, and can’t find anyone else online who has a clue, reach out to the maker (if possible) and see if they can steer you in the right direction.https://books.google.com/books/magazines/language/en Using the info here you should have no problem figuring out at least a ballpark age for your dusty finds.