Hello! We have a 13" cylinder music box and we can find no mark or serial number. It has 8 intricately composed tunes. The only 'unique' identifiers might be the zither attachment that is a screw and not a lever, and the tune numbers stamped on the teeth of the gear that actuates the cylinder shift. I've attached photos. Any help would be much obliged. Luke Schaedle [ Zither attachment [ http://www.mmdigest.com/Attachments/18/12/02/181202_172436_UnknownMB1.JPG [ Zither screw [ http://www.mmdigest.com/Attachments/18/12/02/181202_172436_UnknownMB2.JPG [ Stamped gear [ http://www.mmdigest.com/Attachments/18/12/02/181202_172436_UnknownMB1.JPG