Josette, I think, but am not sure, that label is an older one. I have a Benet gown downstairs, and the embroidery is a brighter blue, and the label says "Professionally dry clean only." Overall, I don't think the label changed a lot, but if my dress is any indication at all, I'd expect to see similar wording and placement of the other tags. The size and care labels are attached with the maker's label. Does your dress have any other labels in it? I can't see enough from the full-length photo to hazard a guess on age; would love to see some close-ups.Almost looks as if it "could be" as early as 60s or 70s. Put sleeves on it, and it looks like a dress I wore in 1972--different fabric, of course! I always think that dating relatively contemporary formal wear is hard--except when you hit the height of the 80s... And then it's hard to NOT date it correctly! LOL....
Perhaps you can write to Tamara above and she can get more info for you (and for all of us!)....