This first pair of French stays are just lovely, described as a "Corps Alsace" and dated at 1770-80. Completely boned, the fashion fabric is an exquisite damask, and lined with a printed fabric. It is unclear what the fiber of the lining is, but the pattern is interesting. The shape of these stays do not really suggest 1770 or 1780 but much earlier. The spade and the spreading fingers at center front suggest a much earlier date. Bound in pink/peach ribbon, they are a work of art, no question. The ribbons at the shoulder straps do look original to the garment.
This Corps a' baleine, is dated 1735-1770, they are giving themeselves a wide range on this pair. Again the spade at center front and the spreading fingers. Decorative false lacing covers the center fronts. This lacing is not functional, but only for display. A beautiful gold damask is the fashion fabric and the stays are fully boned. Ignore the bows, the stylist put those on for the photos. The styling certainly suggests the earlier date.