Codex Oriental Ms. 424, designated by siglum A1 (Horner), t (de Lagarde [= Boetticher]), is written in two languages Bohairic-Arabic, uncial manuscript of the New Testament, on paper.
They were copied, however, from a previous manuscript in the handwriting of the patriarch Abba Gabriel and bearing the date A.
This manuscript of Abba Gabriel again was copied from two earlier manuscripts, that of the Pauline epistles in the handwriting of Abba Yuhanna, bishop of Sammanud, that of the Catholic epistles and Acts in the handwriting of "Jurja ibn Saksik the famous scribe" (or Zagazig).
[1] The manuscript belonged to Archdeacon Henry Tattam, and was purchased for the British Museum at the sale of his books.
[1] Horner used the manuscript in his edition of the Bohairic New Testament as a basis for the text of the Epistles and Acts.