The dresses are definitely 1830s-style, but the plates appear undated (I cannot read the tiny writing at the bottom to ascertain if they indicate which magazine these originally came from). The lack of information is a little unfortunate, but the images are very nice and the colors are bright.
Gotta love those top-knots in the hairdos!
I do love, however, the emphasis on teeny tiny feet (which seems more prevalent in this era than in subsequent ones, though women's feet will always be drawn like pointy little triangles throughout the century. The 1830s strike me particularly as having something of the ballerina implied in them, however.