As far as I know: no grades - only two variations.
The one that you showed (with portrait of admiral at obverse) and one with battle ship at obverse (more common variation) .
Both variations have same reverse with anchor. But only your variation has additional intermediate decorative element between the badge and the pin. Well, maybe it is indeed higher class for enormous donations ...
That's something new! Never saw this badge in such (early type) box. Usually your badge could be found inside wooden box (with purple cushion). The right column of kanji at box cover is indeed different from kanji at boxes for red cross.
The box has purple interior of course... Please show how the fitting looks like
Regards,
Nick