Happy 2013 everyone!
I've been playing around with some 5x7 film that expired in 1944. It is severely fogged with all sorts of other artifacts (streaks, blotches, specks), and the processed negative looks almost opaque to the naked eye. Scanning it was tricky; I'm not sure it would be printable by conventional means. Still, I'm amazed to see any image at all from 70 year old film. Tray developed in HC-110 dilution H for 9 minutes at 66°F.
Century 10A 8x10 with 5x7 back, Kodak unnamed 259mm process lens, 5x7 Gevaert Ultra Panchro film (expired 1944), rated at ISO 12.
For those who are curious, here is the film box: