France 1855 20c Napoleon Postage Due St. Etienne to Carouges Switzerland Cover

Folded cover, franked with 20c blue Napoleon, tied by indistinct dotted cancel, postmarked St. Etienne (28 Jan), to Carouges, Switzerland, struck with boxed red "Affranchisement / Insuffisant" due marking and "35 CS" in black, backstamped Lyon (30 Jan), Geneve (31 Jan) and Carouges (31 Jan), horizontal filing fold, a scarce postage due cover.