Seems like a Series I by the price asked for it. Looking at the back electronics plate, it is an LED battery plate, as no holes for pickup adjustment. You guyz have good eyes to see things like only three pins and stuff. That connector is a hole that cannot be refilled, so it lowers the value, IMO. A shame someone did not trade up for a Series I, and decided to drill a hole in a perfectly good MK to make it look like one, instead. Silly Wabbit!