Locally there is a Seneca 5x7 outfit for sale.
Includes the camera, original back, Graflex/Kodak 5x7 back,
several film holders, rear extension, and lens.
Lens looks like a convertible but has some fungus & lots of dust.
It is in an old century compound shutter.
No focal length on the lens anywhere, but the max aperture looks to be f5.6 or thereabouts. F8 is the smallest listed number, but it opens wider.
Bellows looks good, but I've not tested the corners.
Come in its original suitcase.
I can get it to anyone interested for about $425 shipped.
pics forthcoming.