Oxnard/Cordoba Guild has incorporated the year into the serial number.
One example a forum member posted is "C160003" which implies the 3rd instrument manufactured in 2016. presumably, they will start over in 2017 with "C170001."
While that's an eminently reasonable deduction, the key word in your observation is "implies".
There's another post quoting a "C
A16" prefix on a D20 so I'm already scratching my head about that:.
Originally Posted by Neal:
"The label I saw had CA160003 on the first D-20 sold, I think".
I can understand if it's just a typo but I saw that before I got to this thread and right away I thought of the old Corona system where they
all started with "C" but the next 2 letters defined the model.
And I still can't see the s/n in the photos posted so far.