This item was received from an acquaintance, and I do not have specialized knowledge of musical instruments, so I am unsure if the components are the original combination from when it was purchased. Furthermore, I am unable to confirm the markings on the back plate, the age/lot number, or the DC resistance (kΩ) due to a lack of measuring equipment. I apologize, but I would appreciate it if only those who understand that this is an untested, as-is item would consider purchasing it.