This no. 5 cast iron fry pan is a number 5. The bottom is marked NO. 5, Griswold , Erie PA, 724 B. It is a smooth bottom. T is some very light pitting on the bottom. It is so light that it is hard to see. I guess it could even be the casting. It does need a litttle cleaning as it has a small sticky spot on it. Email me with any questions or if you need more pictures. Check out my other auctions. I have tons of cast iron skillets, dutch ovens and miscelleanous cast iron I plan to list. I am always willing to combine shipping if you win more than one of my auctions! Just email me and I will get back to you with a shipping total. Thank you, Good Luck and Happy Holidays.