Original Navy Cut is composed of pure Virginias, but the pressing and aging has converted some of their sugar and acid into a more hay-like flavor, the partial decomposition of the leaf having released its most irksome elements. What remains is a sweet smoke, with slightly more Nicotine (PBUH) than the average medium smoke, which burns evenly and rewards small “sips” or short slow puffs, as one might take while hammering out words on a typewriter. It also admirably complements the smell of typewriter ribbon, for whatever that is worth.
Virginia flakes such as this tend to appeal to either new smokers who want a blend that is sweet and strong like a cigarette, or to the experienced who can nurse a pipe for hours. Since Tolkien was a master pipe smoker, he fit the latter category, and apparently always kept a pipe going with this and other blends to power himself through late-night endurance test writing sessions.
http://www.deathmetal.org/review/smoking-with-tolkien-capstan-original-navy-cut/