This is what someone posted on my thread . . . they were pretty fast with it, which is really cool.
"To find the date, unscrew the 4 bottom screws. Pull out the chassis. Look for the date handwritten in marker. You're done!! Don't touch the big blue caps or you'll get fried. I'm going to guess yours is 1993."
He agreed that the amp is almost definitely "numbered" therefore, NOT one of the first 500 but exactly #1555 . . . which is just fine with me. It's great to actually KNOW instead of just thinking that I know.
By the way Visual, do you have a Bogner amp? I am trying to learn all that I can about the Ecstacy 101B, as I will be adding it to my studio in the near future, if or when I can. I'm doing pretty good so far.