I recently won an ebay auction which included a roll of Panatomic-X in 120 size. Supposedly the film was frozen, and judging by the K25 that came with the lot, it was since at least 1981. The expiration date is May 1967. Do you have any recommendations on what ISO to expose it for, and what length of time to develop it (in D-76)? This is probably my only chance to use such an historic film, expired as it is.