CRESCENT letter scale

The Crescent made by Pelouze MFG. Co., Chicago, USA is a successful design. Extensive information is given at an earlier presented Crescent. Also a less old version on a heightened base exists, look at the modern Crescent. Different designs of the chart exist, see for instance the pictures at the bottom row. I don't know if the grey lacquer on this little letter scale is original. Below some more pictures of this letter scale.