The 1977 piece was struck by Cincinatti Milacron, the 1977 silver jubilee reverse was used on several different pieces - it impossible to know without seeing the other side. Don't think I've ever seen one in silver, they are usually plated steel, but that's not to say they don't exist.
It's hard to tell from the pictures, but all I know is the Churchill coin is not silver. If you could get some close up pictures on the coins that you think are silver, would be good.
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