I don't know about silver Strikes.
But
Do you know about the Mirage Roulette in your scan.
I have 11 different ones. Only 300 of each color made. I have 3 different edge marks so there must be at least 21 different chips. Some of mine are notched. The 300 number has been confirmed.
I always wondered how they got out of the Mirage as they were only used on a high roller table. I was told it was not in the regular casino, but have not confirmed that fact.