Oliver Winchester established his firm precisely to make breech-loading arms. There would be no authentic Winchester percussion shotgun. However, the Belgians of that era were era were true $*@~*$, ripping off famous names in persuit of selling their junk. It would not especially surprise me to find a trashy old shotgun with some variation of the Winchester name. Rest assured that this is absolutely, positively not a rare experimental, limited production, etc. US Winchester.