Another great name! Though apparently "Jewett Red" may sometimes be preferred.
Nodhead is roughly medium sized with pronounced ribs and a blush that runs from streaky (over greenish yellow) to crimson with deep purplish streaks (rather like the coloring of Blue Pearmain). The blush is accented with many small light lenticels.
The flesh is a tender coarse yellow and carries a good amount of juice. Nodhead is mild and mellow, not at all acid but also not overpoweringly sweet, and with enough range to be interesting. A mild old-style apple with cider and watermelon notes.
As "Jewett's Fine Red," Nodhead is described in 1859 (and is older). Gould Hill Orchard, which grew my Nodhead, says the apple originated in Hollis, New Hampshire. It does not appear to be grown outside of New England.
Update: According to the historical website of the Town of Hollis, this amiable apple, developed by Samuel Jewett, "was locally known as Nod-head from the fact that Jewett nodded his head when walking or talking."
(Thanks to Jewett's many times great grandson, Travis LeMaster, for bringing this resource to my attention.)