Many players don't, and sometimes (unless you bought it from new) it can be hard to tell.
Secondly, primarily for first time users and those needing a "quick and dirty" answer to what there guitar's serial number represents, I have created a "30 Second Guide" to identifying your guitar.
The only difference is the addition of this batch indicator.
Les Paul Classic: This model features an ink stamped serial number with no "MADE IN USA" (just as we used on the original 1952-1960 Les Pauls).
This section is intended to be a quick and dirty guide to ID'ing whether a guitar is a Late Sixties Les Paul (LSLP) using its serial number.
If it is an LSLP, within thirty seconds you will know what era it came from and a general shipping date.