Hello and welcome. I wish I had some good news for your grandfather, but unfortunately, I do not. I can;t speak for the authenticity of the first coin, but the two others are definitely modern replicas.
The knife coin is a replica of the extremely scarce Wang Mang 5000 cash knife coin. Genuine examples have the characters on the round end inlaid with gold, not raised up as they are on this piece. Compare it with this genuine piece on zeno.ru.
The third piece is likewise a replica of a rather scarce item, this time one of the large multiple-cash coins of the Yuan (Mongol) Dynasty; compare it with the examples here.
The knife coin is a replica of the extremely scarce Wang Mang 5000 cash knife coin. Genuine examples have the characters on the round end inlaid with gold, not raised up as they are on this piece. Compare it with this genuine piece on zeno.ru.
The third piece is likewise a replica of a rather scarce item, this time one of the large multiple-cash coins of the Yuan (Mongol) Dynasty; compare it with the examples here.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis

























