American AcornsMassachusetts Soldiers and Sailors of the Revolutionary War, vol. 11, p. 598: the entry 'Oak, Seth, Winchendon', sergeant in Capt. Moses Hale's company of militia, Col. Nathan Sparhawk's regiment, on the Lexington alarm of 19 April 1775, and later in Col. Ephraim Doolittle's regiment, 1775 (sergeant, then quartermaster sergeant).
Image · dated 1775 · source: Secretary of the Commonwealth of Massachusetts, 1904; Internet Archive (public domain)
How it is shown: Complete page as supplied; no crop, no retouch, no search highlight.
Keep in mind: What the page says: Confirmed. The entry reads 'OAK, SETH, Winchendon. Sergeant, Capt. Moses Hale's co. of militia, Col. Nathan Sparhawk's regt., which marched on the alarm of April 19, 1775, to Cambridge; service, 14 days; also, Capt. Abel Wilder's co., Col. Ephraim Doolittle's regt.; ... also, Quartermaster Sergeant, Col. Ephraim Doolittle's regt.' The page also holds a separate 'OAK, NATHANIEL' Bolton pay roll of 1780 and other Oak entries (Sylvanus and others), which are not tagged. Whether this is our person: Likely, not Confirmed, that Seth Oak of Winchendon is the tree's Seth Oak (b. 1733), by the surname, the era and the Worcester County area of his 1755 and 1777-78 service; the entry gives no age or parents.