Aw Phooie.
It may not be an S/N after all.
I took another look and....oops...it's a fabrication number instead.
It's listed on the outer box flap, and the way it has been penned on the label it looked at first as though it were an S/N.
Then again, looking at the label it does list the Sennheiser P/N of the HD600 and then the penned in Fab No. right below it, so perhaps it actually could be a serial number. The number is 68333 which could well be the number in sequence of build since I guess these guys have been in production at least back somewhere into the 90s. I can't find a number anywhere on the cans though.
Hmmmmm....I love a good mystery!!
