This is a nice clean Stanley Square with a 0 - 6" scale on it, with the brass and rosewood handle area and the steel blade that is about 7.5" long overall. This is an older square, it's clean but needs working surfaces checked and re-squared.  Over time, it seems these square do lose accuracy to some extent, for checking before use is a good idea. This one is not marked by the maker that I can see, but matches others I have that are marked.