I would appreciate any information about this series, catalog numbers,
matrix, details, recording and issue date, label scans - I have seen
AF1 Rosa Ponselle Il va Venir (LA JUIVE)/Elsas Traum (LOHENGRIN)
AF3 Olive Fremstad and Lillian Nordica -
AF appears to stand for ADDISON FOSTER, Philadelphia based founder
of the AMERICAN GRAMOPHONE SOCIETY.
Best wishes, Thomas.