It seems I came accross this a bit late. So much reading to do and so little time. Maybe your son will become a lion hunter. Here are a few that I like.
I've seen the lion on that 50 franc Congo note on a stock certificate. From Canada, I think. I'll try to figure out which one and post some details.
Ha! I just stumbled on this thread after, um, three years. Here's the lion I promised -- on a stock certificate for Dominion Stores, printed by British American Bank Note Co. Sorry for the delay.