Googling for "SGPFF edge code" comes back with (there was a url link here which no longer exists) post, which indicates the film was JandC Pro 100.
JandC rebranded film. In more general searching, Pro 100 was known to have been made in China, and was most likely ERA 100 (as far as I can tell there is no 400 ISO film, only 100 ISO).
So, best guess, it's probably ERA 100.
Incidentally (and you may know this already - I believe you've indicated you work in a photo lab), if you're unsure of a B&W film and have the ability to do a 1-off in a standard daylight tank, you can always try stand development to develop any B&W film to completion. I've been trying this recently with great results using Rodinal 1+200, agitate first minute, let stand remainder of 2 hrs.