- Moscow, State Historical Museum, ms. Sinod. gr. 207: page range 25v–26r
- Acquired: donated by the estate of L.G. Westerink
- Film: 35mm Black-and-white Negative
Prof. Westerink's note:
"Gosudarstvennyi istoricheskii muzei (Moscow, R.S.F.S.R.). Manuscript. Gr. 207 (250 Vlad.). ff. 32 verso-33 recto. Pope John to Photius."
At the beginning (in Russian): "Sin. gr. 207".