This is the well-known BOSS OD-1 Overdrive. Based on the serial number, it was manufactured in 1983, making it one of the later OD-1 models. It was produced during the period when the SD-1 was also sold. The op-amp is a glossy JRC4558DD, as shown in the image. Compared to the early quad op-amp versions, it doesn't seem to be as popular, but the mid-range push is different compared to the SD-1 from the same period. I've taken good care of it, but due to some circumstances, I'm selling it to declutter. I've referenced the price range on sites like Digimart for similar models from the same era. There are some paint chips consistent with its age, but I think it's in good condition. Thank you.