I own a Square Shoulder J45 Deluxe, Tobacco Brown. It sported Kluson tuners, and the fancy pickguard, with white V inlay on rear scrap plug area, neck to body heel white cap, it featured a real fast slender neck profile. It was notably lighter than any other J45 I ever p[icked up, due it's thin spruce top (which I measured at just over 1/8"). Maybe someone mod'd it? I checked out SN and I seemed to think it was 1978. But I easily could be wrong as SN listings can be confusing.
It's still my favorite.
Later,
Billy