You have to be an Einstein to figure out what's going on here with the link to proving who in fact saved the prince's life being a commemorative coin with the engraving of the person who did save him on it. Which happens to be Tom not John who got the credit as well as fame and money for doing it. For this to be a Perry Mason episode the person designated to be murdered was old Uncle Ben Farady,Herbert Rudley, who was the president of the highly successful Farady Shipping Company and grandson of John Farady. And it was Philip Andrews who was seen leaving Uncle Ben's house just moments before he was discovered murdered who was charged with the crime! With Perry defending Andrews the main piece of evidence to clear him is the what's now missing coin with Tom Farady's image engraved on it. Even though if you think about it what the heck would that have to do in proving Andrews innocence anyway?
****SPOILERS**** In the end we get some comfort in knowing that the commemorative coin have nothing at all to do with Uncle Ben Farady's murder. It was just a red herring planted in the story to keep our minds off to who really murdered Unce Ban and the reasons why he or she did it. You see while all this coin business was going on Uncle Ben was being robbed blind behind the scenes of his shipping company stock and the person doing it was using all this confusion in who save the Malayan's prince's life, Tom or John, as cover for his actions. That's until Uncle Ben found out about it and ended up getting murdered by him!