This SAILDART content blob sn#125636 has 2 filenames:

1974-10-17 17:25	MAIL.BKP[1,TW]1
1977-03-25 14:02	MAIL.BKP[UP,DOC]2

This blob is marked generic text, type T, neo UTF8
Octal listing of 6 PDP-10 words: