9 officer's portraits of Saxon Kronprinz Kuirassier, 1730's

Christian Friedrich, Graf von Haxhausen
Unknown author
(link to Sotheby's cite: link)

Sotheby's presents a set of 9 Saxon officer's portraits (link). I believe, it's Kronprinz (Prinz Friedrich) Kuirassier: dark-blue regimental color, yellow metal. The uniform is dated 1730's.