Steve,
Yes, although until 1971 it was rated 350 watts.
Royal upgraded the motor size on these cleaners every so often. From 1971-75 cleaners like these were rated 400 watts, then in mid-1975 it was rated 3 amps for all models. Starting in late 1980, their deluxe machines were rated 4.5 amps (followed by the commercial machines in mid-1981), then they were rated 5.4 amps from late 1985 until mid-1987 when Royal overhauled its household line of cleaners which had new amperage ratings of 6 (and, starting in 1990, 7).
Second, a Royal shake-out bag would have an exposed black bag top on it.
~Ben