I'm looking for some information on a Madeira I bought at a yard sale. Its been in storage for a long time. Its a C-600 but the sound hole sticker is different from any I've seen online. The C-600 is handwritten with a pencil and the serial number appears to be hand carved into the headstock. I'm just looking for an age and maybe what its made of. Can't find info on this specific design. I've attached some photos.