【Product Description】 The BOSS DS-1, loved by many legendary guitarists, still reigns as the synonym for distortion pedals. This unit, based on its serial number and circuit board components, is an extremely rare early model from 1979 (made in Japan, silver screw era). At its heart, it features the "TA7136AP" op-amp, which produces the thick and musical distortion unique to the early models. It's characterized by a stickiness in the mid-range and excellent picking response, setting it apart from current models, and is a sound that vintage BOSS fans will love. The exterior is in "player's condition," showing signs of long use, and exudes a vintage feel (relic look). The internal circuit board is also in good condition, allowing you to fully enjoy the authentic distortion sound only this era can produce. The number of early models is decreasing year by year, and models equipped with the TA7136AP are particularly experiencing a surge in market price. This is a gem that we highly recommend you get your hands on, whether for your collection or if you're looking for the ultimate main distortion. 【Condition of the Product】 Functionality: Tested and confirmed to be working: Output, effectiveness of each knob, and effect ON/OFF are all good. Appearance: Overall, there are significant signs of use, such as paint剥げ (peeling) and scratches. Special Notes: The screw on the lower left of the back cover is broken and remains inside the screw hole (see photo). Although it can be secured with the remaining 3 screws and the silver screw, please be aware of this. 【Included Items】 Body only *All items shown in the photos are included. 【Notes】 When using an AC adapter, please use an ACA adapter, which was the specification at the time, or batteries (the current PSA adapter may not perform to its full potential). Due to the vintage nature of the equipment, there may be minor scratches or noise that cannot be fully captured in the photos. Please note that the item may be sold out as it is also listed on other sites.