- Mount Athos, Dionysiou Monastery, ms. 274 (nunc 168): page range 487v–499r
- Acquired: donated by the estate of L.G. Westerink
- Film: 35mm Black-and-white Positive
Prof. Westerink's note: "Mone Dionysiou (Athos, Greece) Manuscript. 274. ff. 489 recto-verso. Photius, Ep. ad Zach."
At the beginning: informational sheet of the Patriarchal Institute for Patristic Studies in Thessaloniki, dated on 19 June 1973.