Oh boy, embarrassing but funny

I felt right on par with drowsy Joe earlier today. My neighbor and I have been trading goods, such as eggs for bullets, etc. So he gave me a batch of old 44 mag brass to load for him. After I cleaned it up I saw a few smaller cases. The headstamps had foreign lettering but were stamped 61x6.... I thought to myself wow that looks awfully close to a 9mm case size. Well after comparing another 9mm case side-by-side, I came to the conclusion that I am in fact an idiot. As the case rolled along the counter top, 61x6 turned into 9x19.... I laughed out loud.