well, it's got only a single number on the dial at the end (everything else is letters) which gives you 3 letters to make a month and there's only one 3 letter month. I don't know if there's any clue beyond that but I think just knowing you're specifically looking for a date narrows everything down so much it's not really brute forcing anymore. more like just a bit of logic
ah ok. See I was thinking shortening the month to 3 letters Jan, Feb, Mar, Apr etc and there were a few options for that. So I felt like I brute forced it because May was the first one I tried