Antique ID'd, Dated 1777 Portrait Miniature PAIR, Man and Woman, Ukraine Estate

Buying antiques out of Russia is problematic. I have a grouping of 3 from a family, sold out of Ukraine, that span nearly a century. This is the first, and the earliest of those (offering/selling separate). In their time, it was known as a Cossack Republic, though boundaries moved and changed. The Ottoman Empire, Polish-Lithuanian Commonwealth, Austria-Hungary and Russia, all claimed and covered the Ukraine over time. This handsome couple, each identified (view images) and each dated 1777, survive beautifully on their own, but someone has put them into a newer wooden display frame with lush silk velvet mat. Their small oval brass frames, original convex cover glass. The larger rounded corner rectangular wooden frame and silk velvet mat are a much later, possibly c.1900, modification, and matches the other portraits from the same estate. I can't link them as family, but it seems possible they were. Still, we'll offer them separately. Measurements are noted on the photos.  Very good to e