I can't speak for anything other than the '38 but the standard filter wasn't an oil "bath" filter. It used oil soaked copper gauze as the one you pictured the label on. The heavy duty as I have on my '38 was an oil "bath" filter where you actually poured oil into the housing after oiling the gauze. I assume the same held true with the newer models but I don't know that for a fact.
Pages 167-168. The oil "bath" filter held one pint of oil in '38 as noted on page 168.
