I have a washburn monterey custom studio acoustic/electric ea 40 pla with a purchase date of Jan. 23, 1984. No soundhole label and listed on original tag as NSN on the serial number line indicating this guitar has no serial and there is nothing on or inside the guitar. I have all original tags and that's where I'm at. Hard to find info. I don't know if its a protype but I would to find rarity of this particular model and value.