Siglum: 
US-BosMApc D-0r3s1 (fragment)
Description: 

Fragment containing mass chants. Purchased on eBay in 2014, where it was identified as Italian. Southern Textualis hand; four line red staff with square notation. Alternating red and blue initials with some filigree.

Labelled CCXIII on verso side.

Currently privately held in Boston.

https://fragmentarium.ms/view/page/F-r3s1

Fragmentarium ID: 
3rs1
DACT ID: 
03rs1