Richard, the serial number of that very tasty BB of yours reflects that it's Alembic #14,498 overall. True, the old serial number system started with the build year, then one or two letters to reflect the model (or none for a Series instrument) and finally the actual serial number - which basically started with #1 back in 1972. They no longer put the year in front.
BTW, the bass in my avatar is #14,507 - pretty close to yours, and it has a healthy dose of BB in its genetic make-up too. Official birthday was March of this year.