Eastman Serial Numbers

[Blackmore Fan]

So I have an AC320 that I bought used a few years ago.  I'm curious how old it is--does it sound this good because it IS this good, or in part because it has "opened up".

The serial number is 11055599.

How old is this guitar?

[Pura Vida]

Here you go:  https://www.eastmanguitarfans.com/Thread-Serial-Numbers