Made in Germany and includes a US patent number on this Trutone pitch pipe. The Worlds Best. Marked as shown M Hohner No 1 Violin and Mandolin. The slide moves easily on the bottom to change the pitch from G D A F. In good usable condition it measures 2 1/2 inches in length and 1 1/4 inches wide. It will sell with a low start and in as found condition for your collection. We sell a variety of items check us out.