France 1858 10c + 40c + 80c Napoleon FL Cover Paris to United States Brazil

Folded letter, franked with 10c bistre, 40c orange (oxidized) and 80c carmine, tied by "K" diamond of dots, Paris "K" c.d.s. alongisde (1 Dec), to the Attaché to the Brazilian Delegation in Washington, D.C., United States, endorsed "voie de Liverpool", with "5 / BOSTON BR PKT / DEC 25" c.d.s. on front, backstamped with Paris A Calais transit (4 Dec), an uncommon franking. (Yvert 13A, 16, 17A)