That is a great find, thanks! While sorting through old bags of coppers I've always glanced in hope of finding something like that for years other than 1962.
From what I can see (and I am sight challenged), there appears to be five parallel lines. That would mimic the 'guitar' version found on the '62, whereby there are five lines of approximately the same length. I think on the 'harp' version, there are four lines of varying length, however I faintly recall hearing about some five string harps out there somewhere.