Superman # 30 1st app. CBCS 5.0 scarce Golden Age book! Grade is CBCS 5.0. Please check scan for condition. The item “Superman # 30 1st app. Of Mr. Mxyzptlk! CBCS 5.0 scarce Golden Age book” is in sale since Monday, November 6, 2017. This item is in the category “Books, Comics & Magazines\Comics\US Comics\1938-1955 (Golden Age)”. The seller is “qscomics” and is located in Wakefield. This item can be shipped worldwide.