I think FelineNut is trying a little hard: the index numbers on a patent drawing and the part numbers on a finished assembly have nothing to to with each other, and the B777 cowl components he cites are compound curved, not simple curved as the found item is.
FWIW (which isn't much) the numerals on the found item ring a faint and Russian bell in me. The "3" especially doesn't look like a font an American maker would use.