Hi, I’ve done some research but still need some help please.Are these 3 ply maple poplar? The seller says 1967 they are 6 digit serial numbers. How do they appear to you guys. Thank you. https://images.craigslist.org/01717_49qGnF4r0Msz_0pD0t2_1200x900.jpg https://images.craigslist.org/00G0G_9v4ZnLK4s3wz_0r10t2_1200x900.jpg https://images.craigslist.org/00U0U_7FSBT89Bg1Jz_0sV0t2_1200x900.jpghttps://images.craigslist.org/00Q0Q_33esHPWZgkRz_0CI0t2_1200x900.jpghttps://images.craigslist.org/01313_eQWVViVXhWdz_0tJ0t2_1200x900.jpg