New to Guild and TGF, I recently purchased an F45CE BLD Serial no. starts with F4504xx. I am having trouble determining the date of manufacture. Also, while the instrument seems like it is in very good shape and sounds great, there is a lot of cracking in the lacquer finish. The finish is intact despite the cracking/crazing. Is this normal for this vintage (I'm told it was built in 1980) or has it had some exposure to extreme temp/humidity changes along it life? Appreciate any insight you can offer. Thank you in advance. -David