The base is Olympic White and badly yellowed which makes me wonder if it is nitro and not poly. I'm assuming that nitro yellowed more and since Fender went to poly in '68 (I believe) it got me thinking. I'm wondering if the body on my jazz is actually a '67 and the neck a '69. The neck is dated May '69 so that is an easy one The neck plate is six digit 172XXX and the pots are 66/67. When I first bought it I thought the neck plate was for a '70s Fender. Any thoughts on how I could positively id the finish or body date?