I'm guessing the chart for my camera would have come on a card or something similar.

I do have ISO 50 film. I'd heard that the standard for ASA/ISO had changed but never did track down how big that change was.

I have an inexpensive light meter I could mount to the camera. I could load up with ISO 50 film and make my own cross reference sheet. It might take time to accomplish though. Perhaps time for some controlled light level experiments?

Thanks for your help.