There were two owners manuals issued for the NAA. Yours is the first one published in 1952, form number T400-K52. The second one with the red cover is form number SE5943, published in 1954. I've read them both cover to cover and the red one is a better manual. Explanations are more clear and the writing is easier to follow.
I just checked the oil capacity specs in both books and the red 1954 edition does add an additional quart over the first manual with the tan cover.