Serial number 8800, the first and second generation (quad op-amp era) with silver screws. Modified by a specialist shop for ease of use. 〇 LED Lighting Improvement ODs from this era have an LED that briefly lights up and then turns off when the effect is turned on. During a performance, it can be difficult to tell "Is it on or off?" Therefore, the LED now stays on constantly while the effect is active, just like modern effectors. 〇 Power Supply Improvement The DC adapter power supply is the old ACA type, which is not compatible with the currently common PSA type. It's also difficult to prepare a dedicated adapter, so it has been modified to run on 9V supplied from a general power supply. The modifications were done by a professional effector repair shop. Both modifications have been confirmed to have no impact on sound quality. Operation tested. The unit will be shipped as is (no box or accessories). ※ Because I have a cat, there may be some cat hair that hasn't been completely removed from the cardboard box, etc. If you have allergies, dislike cats, or are concerned about this, please refrain from purchasing.