1 k9frank 4 weeks ago Thank you in advance for any help you can provide me. I have had a Gretsch Classical Acoustic Guitar with a paper label and the serial number (363) penciled in. The model # is 6001 also in pencil. I have been researching to find the date. According to the information I was able to find, 3 digit serial numbers were written on the wood in side the back of the guitar, not a label. Labels were printed (typed?) not done in pencil. Does any one know what the real deal is? Thanks!