There are a lot of experts on TB who know the details of the versions better than I do, but I own cabs of both versions and the series II's that I own have that designation included on the front name plate. They also have everything on the back panel printed. My series one's have the model, impedence and power rating hand written on the back panel. The grille is also different, but I believe some early series II's had the same grille as the series ones.
"The truth is more important than the facts." - Frank Lloyd Wright
This one doesn't have the "series 2" badge but does have the printed label serial number. I seem to remember a UL310 I used to have that was the same way...a very early series 2 without that designation on the badge. But I could be mistaken.
It's a series 1. The "T" designator is the earlier model with a tweeter. I just bought the same cab (T-210 UL, 4 ohm) about two months ago and it is simply amazing! 38.5 lbs. I'd buy her if I hadn't already spend my money on her sister!
Earl - The "Dangerous Bass King" of Austin, TX
Texas Bassists Club #131
Cold Snap - THE blues band of Round Rock!
Thanks for the help. I don't know why I got it in my head that
it's a series 2. I've had so many Epi cabs I'm just getting confused. Now I'm even having second thoughts about selling it! I do have a UL310 series 2 I may sell instead.