1175 Mac (and others),
Here are two new First Flight Covers that I just acquired from the suggestion above. (still looking for ANY Newfoundland FFCs)
I've got 64 so far--so these two bring it to 66 (no duplicates--all unique FFC according to AAMC and NSSC). I'm trying to acquire every single FFC listed in the AAMC book. I've missing about 28.
Enjoy these
AAMC - FF45 with C7 or C9 stamp from 1931
AAMC FF5a with 117 from 1921

