Colin has the correct advice. It will not have gained speed so you can forget about shooting it at anything more than box. If it were mine and I had multiple rolls I'd do a clip test if 135. I'd rate the film 200, 400, 800 and maybe 1600 on three or four subjects of distinctly different light settings (broad day light/high noon w/ dark shadows and lots of contrast; overcast with no or open shadows and minimal contrast; and perfectly lit skin). process the exposed bit and spool the rest back into the can. Leave a bit of leader out of the can and a couple frames extra on the cliped portion. Soup it normal and see what you get.
If the film is good and you like grain than I have gotten beautiful painterly images with similar film overexposing by 3 or 4 stops and pull processing it by 2. The trick is finding a place that can pull process at 2 stops and having desire to experiment .
Last edited by jd callow; 01-12-2010 at 10:17 PM. Click to view previous post history.