See our TS9DX page for more info on this pedal. The input jacks on the late models were terrible and tended to jam, with the plug stuck in tight. So from what I've gathered from Feliss' linked and what I googled. The TSs are seen in the middle. Oh, these look good to me.
They did seem to start using them in the USA more recently.
Date of Ibanez pedal
Analogman has a bunch of dating information on his web site for Tube screamers but it may get you close as to the series and date based on specifics of the case or innards. However I have seen a TS9 with serial number with a silver label. Some people are happy with these but most prefer the older ones. I don't want to shatter your dreams or anything, but I don't see an advantage to "Vintage Pedals". Well, whenever I want to date an Ibanez, I ask it real nice, and show up with flowers and candy The Maxon OD-9 was released in the summer of