I have a quick question on how to distinguish what year a fender precision bass is from. I have an opportunity to get a 1968 fender precision (or so I am told), but when I went to see it; it really doesn't look like a 1968 fender precision to me - - not that I am an expert. It's got active pickups and looks way too "new" to be almost 40 years old. Is there a way to tell from the serial number what year it was manufactured? Thanks.