We appreciate the classic simplicity of Richard Avedon's 1963 oxford blue stationery with dark blue engraving, found on Letterheady. It's as elegant as his fashion photography; but possibly a bit more understated! You can see a wonderful archive of Avedon's work here.
Image courtesy, Richard Avedon [Dovima with elephants in Dior]
Avedon stationery courtesy, Letterheady