I see this dress here, being called late 1960s: Code: http://pinkyguestvintage.blogspot.com/2010/07/back-in-black-plus-plaid-pastels-and.html Late 60s is my first thought, but I do not know.
Could we see a close up or get a description of the sleeve, particularly the cuff area? Does it have an Edwardian style to it? Balmain was into ruffles in 1968.
Barbara, the sleeve cuff is interesting. it has a zipper with buttons-no holes. The rhinestones appear to be glued on at the center. Here is the cuff and CB closure. CB has buttons and faux buttonholes with a zipper hidden underneath. I can add the number if we started adding the numbers it would sometimes help with dating.