15 grams of Silver for the Queen's 90th

I'm mostly into old coins, they're my favourite. However I do make an exception for The oyal Mint who continue to make these beautiful coins, notably the £20, £50 and £100 coins. I buy them all! I can't resist. The fact that their legal tender makes it even better. You pay £100 for a £100 coin, you pay £50 for a £50 coin and you pay £20 for a £20 coin. And they are 99.9% silver. Does that seem like a good investment? 

Nevertheless if it's not a good investment I can't wait to get to 90 years old in the year 2084 and say wow, look at this £100 uncirculated coin from the year 2015. That's what I'm doing it for. 

Happy Birthday once again Your Majesty.