This concertina was built around 1925. It is a Sitek Triple reed concertina. Sitek concertinas were made in Chicago. This one is unique in that it has an extra set of reed plates so that it can be configured as either a high triple or a low triple depending on which reeds are installed. As a low triple it has 1 low, 1 med and 1 pic reed set. As a high triple it has 2 med and 1 pic reed sets. Key of C, green finish, serial number 35 built by Walter Kadlubowski at International Accordion Company. This concertina belongs to Gary Sudol of Griswold, Connecticut.