Before there were Style 45 Martin guitars, Style 42 was the highest appointment level the company offered. While typically these models featured a pearl-bordered top and pearl fingerboard inlay, they did not have any pearl inlay on the headplate or on the back and sides of the body. The 00-42S changed all this and included pearl on all the areas that Style 45 guitars would have when they were first cataloged in 1904. In addition to the standard snowflake fingerboard inlay pattern found on Style 42 guitars, the 00-42S featured a vine pattern inlay that ran the entire length of the fingerboard and on the top of the body and featured a pearl-inlaid, mandolin-style pickguard.