A better choice might be a university library, where it can be used by researchers -- even better if you have more than just the journal, and can donate "The Mr. Grandfather Papers" in their entirety, because context matters in research. Good university libraries, with the proper facilities, are able to take care of valuable and fragile papers, and have strict rules about their use and handling for research.
I don't know if you would still own it or not, with a university library. But, like any visitor to the university library who follows the rules, you would be able to look at it and consult it.