At 70 grams, that's about 2 troy ounces (assuming it's made of sterling silver or thereabouts), so it's US$53 in bullion value alone.
At just $140, or $87 above bullion value, for a nice, artistic, historically significant medal? It's a steal. I don't even collect medals very strongly and certainly try not to buy medals this large, but I do collect "railway things", and if I saw that for $140, I'd want to buy it.
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