For US instruments, the serial number will start with a letter. That letter indicates the decade. The second character will usually be a number. That number indicates the specific year.
Why do guitars have serial numbers?
Although a serial number is helpful for roughly determining the age of a guitar, this is often not the exact date. As a result of the overlap between years, Fender serial numbers are also not by definition chronological. In the past (we are talking about before 1976) the serial numbers were often randomly assigned.
How do I know if my guitar is acoustic?
Although comparing body shape isnt always the easiest way to tell apart the two, there is one key difference in construction thats easy to spot: acoustic guitars usually have a scratch plate (the piece of plastic next to the sound hole that protects the body of the guitar while you play), and classical guitars do not