So I'm planning to go out and shoot this super old roll of film in my Yashica Mat 124 sometime soon in the future, perhaps to do some night photography. I have no idea what the results are going to be colour-wise but I guess that's the fun of photography!

When this film was sold in 1960, it had an EI of 32. I've heard that even with good film storage in a freezer (which is what this film has had since day one) that the film could lose as much as one full stop of EI/ISO every decade. I have been struggling to figure out at least a good estimate of what the EI/ISO would be today so that I can meter accurately. Any ideas?