The serial number of the 365 O.S. indicates that it's from March 1966 - in other words, it starts FC. Something seems particularly apt about that to me.

The 12-string is "only" FF, and thus June '66 (the month of my ex-wife's birth!) - but oddly enough, it came with the earlier style of case with no "goodie box," and the O.S. came with the later case with goodie box - ah, the vagaries of Electro....