In aeternum et in saeculum

Source: 
Aachen (Aix-la-Chapelle), Domarchiv, G 20
Folio: 
049r
Sequence: 
9
Feast: 
Dom. per annum
Office/Mass: 
V
Genre: 
A
Position: 
2
Cantus ID: 
003204
Mode: 
8
Finalis: 
G
Differentia: 
C2
Differentia database: 
1--k-k-j-h-k-k--4 103e
Extra: 
038r
Indexing notes: 
the final is "G", even though this differentia appears quite similar to mode 3 patterns ...