Here was my thought on it's origins from a week or two ago -
"Another thing is that he has a Cyr trophy which is/was used at the Arnold Classic, chances are that the Sandow and the Cyr came from the same person. I'm thinking it's from Ben Weider's estate. He'd have easy access to an extra Sandows, and was a huge admirer of Cyr, so he's was bound to have an original Cyr trophy or copies.
Indeed, there is even a picture of Ben Weider with a similar or exact Cyr trophy here on the upper left -
. ".