Might I suggest that you keep this group of marbles together as they will always mean more to you this way. I have kept all my original marbles this way.
As a group my marbles are rather non-descript, but rediscovering them about 6 years ago sparked my interest in marble collecting. Although I now have many marbles more attractive and rarer than my little hoard of hard won mibs when I was 10 years old, nothing will ever eclipse my original marbles.
As a tribute to the elderly gentleman who relinquished ownership to you, I think it only fitting to keep them together. But, of course, that's your call to make.
Nice marbles!!!