Old Capitol A. Graf Dist. pre pro shot glass

I'm putting up for bid this Old Capitol shot glass. It is about 2 inches tall and 2 inches wide at the top. The rim seems to be perfect-no nicks or flakes. There is a hard water stain on the bottom of the glass that I think shows in the picture. I am afraid to try to clean it as this is extremely thin glass and I'm clumsy. There is also a very small crack on the bottom that does not go through or up the side (see picture). From what I could find out, it is from 1905. Under Old Capitol it says "A. Graf Distrg. Co". and under that, "St. Louis & Louisville".  Feel free to email me any questions. Thank you.