Vintage 1960s Batman comic, first print

Yesterday around 2:15pm, I realized my vintage Batman comic from the 1960s is missing. It's a 7x10 inch issue with a bright yellow cover, a couple of creases along the bottom edge, and a small coffee ring on the back. I last had it near the antique row along Last Chance Gulch in Helena, just outside the Capitol Building area after stepping out of the coffee shop on Main Street. This one means a lot to me because it belonged to my grandfather, a real keepsake, and I really hope to get it back; if you’ve seen it, email [email protected].