Codex Sinaiticus (01, א) alone has a complete text of the New Testament. It is dated to c. 330–360 C.E. The codex is an Alexandrian text-type manuscript written in uncial letters on parchment in the 4th century. Scholarship considers the Codex Sinaiticus to be one of the best Greek texts of the New Testament, along with the Codex Vaticanus.
CODEX VATICANUS: Why a Treasure?
Codex Vaticanus (03, B) contains the Gospels, Acts, the General Epistles, the Pauline Epistles, the Epistle to the Hebrews (up to Hebrews 9:14, καθα[ριει); it lacks 1 and 2 Timothy, Titus, Philemon, and Revelation. It is written on 759 leaves of vellum and is dated to c. 300–325 C.E.
Greek Uncial (Majuscule) Manuscripts of the New Testament
Biblical manuscripts that were written in Greek (whether translations of the Hebrew Scriptures, or copies of the Greek New Testament, or both) can be divided or organized by the writing style, which also helps the paleographer in dating them. The older (earlier) style (especially from the fourth to the ninth century C.E.) is the uncial manuscript, written in large, separated capital letters. Uncial is a majuscule script (written entirely in capital letters) commonly used by Latin and Greek scribes.