It's pretty close to seventy years since this iconic series of guitars was first produced. Surely then there were inquisitive owners or enthusiasts at that time who bought the guitars new or even used and at some later date, who might have asked this same question regarding their guitar at some point. A question that is still puzzling current day owners. Some of those people are likely still with us. People are actually still buying or trading for them - at least the very lucky ones are. I can't believe that taking into account how many questions are actually asked on this forum alone, and which are usually answered in double quick time by our own experts, and usually in regards to the most cherished of our guitars, the Telecaster ....... that the one guitar that spawned this whole website, is still harbouring it's own secrets. Ask what Thadeo's mother-in-law's maiden name was, and someone will give us the answer.