5x8 f5 Briggs Special Portrait
nice glass, functioning aperture
(plenty of blades - didn't count though)
Briggs was a photo dealer - so after some research - I found that this is a rebadged
Burke & James 5x8 Cephaloscope 9" f5
which is a pretty decent lens
covers 5x7 for sure, probably 6x8
w/o mounting ring
Picked up at an Estate Sale