>>4129307both naming convention and apparent corporate connections suggest that it is a variant of the Konica films of similar ISO.
negative film stored in freezer from 97 should be fine (let it mellow at room temp for an hour before loading). Recommend shooting part or all of a roll at box speed and developing it and then see if you need to adjust more than that for later rolls.
the much vaunted "1 stop per decade rule" is hipster trash
here are more useful axioms:
1. usually storage conditions (cold/dry/dark) matter more than age
2. age reduces sensitivity (iso)
3. age reduces sensitivity of faster >250-400 iso films much more quickly
4. black and white ages better than color of equivalent iso
5. general best practice is to shoot some of the film at box speed, see how fogged it is, and then to over expose the next roll 1.5 stops and have the film pulled in development.
This is crucial because you are trying to build density on the negative that outpaces the fog's impact on the image. Ergo more exposure, less development
Wild card: if it's slide film, shoot box speed and see if it's shit, if it's shit you have to get way creative with overexposure, under development of the first developer + benzotriazole then normal development for later steps. slide film is much more complicated for this
