This is a BOSS SD-1 SUPER OverDrive. The item includes only the main unit. *Box, manual, adapter, etc. are not included. Operation has been confirmed. ACA power supply type. *When using an adapter, if operated with anything other than an ACA power supply, it may not function correctly. MADE IN JAPAN (Made in Japan). Stamped serial number 12XXXX, manufactured in 1981 according to a "serial number decoder". The circuit board is ET5212-512B (dark brown), and the op-amp is NEC C4558C. There are some scratches, dirt, and touch-up paint. Shipping will be via either Takkyubin Compact or Yu-Packet Plus. *The shipping company may change depending on the circumstances, but the shipping cost and anonymous shipping will remain the same. I will not answer questions about serial numbers other than those disclosed in the images. ↓ Other specifications of OD-X, SD-X are also on sale. ・SD-1 BOSS Super OverDrive Boss Made in Japan 1981 #BOSSSD1JP1981 ・SD-1 BOSS Super OverDrive Boss Made in Japan 1987 #BOSSSD1JP1987 ・SD-1 BOSS Super OverDrive Boss Made in Japan #BOSSSD1JP ・OD-2 BOSS Turbo OverDrive Boss #BOSSOD2TW #Effecter #BOSS #Boss #OverDrive #Overdrive #Made in Japan #BOSSSD1JP1981