Lever action rifle? That would be a model 1892, which may well have been made as a commemorative or limited edition by Miroku of Japan for Winchester. Probably sometime in the 1970 through 2000 period.
A winchester rifle made in Japan? They made most, if not all, of their rifles here in the US (in connecticuit). Are you sure it doesn't say '.44-.40 Winchester' or something like that? That would mean that the cartrige the gun fires was designed by winchester and was adopted by this japanese gun company that's my guess.