This is a nice clean older expansive/expandable bit in sharp ready to use condition. It's marked "CLARK'S PATTERN PEXTO" and also has depth gauge markings to 7". It expanes from 1 3/4"-3".  Sharp and ready to use. No rust, minor staining, very little wear. A nice one!   The PEXTO logo is that of Peck Stow & Wilcox Co., a well known, respected tool maker in the early 1900's.