You can always pull the chasis out the the head shell (even if it's a combo) and there should be initials and the month and year of it's final inspections.
Just be careful and don't touch the capacitors as they store a charge. The look like c-cell batteries.
You can call mesa and ask for customer service and give them your serial number and they can tell you... If the guy says 'we don't really keep a database' have him check the computer anyway, or call back and talk to someone else.
Would it hurt to post the serial number here? I mean, there's no harm that can be done, right? I'll have to go look and maybe one of you fellas can find out for me if I don't just go 'head and call Mesa.
That's what I was trying to say, rather than asking where you can find info about your serial number, why not let these guys just tell you, they know revisions and whatnot.