In answer to your question relating to the original Harrah's Metropolis card......The original Harrah's (Gold/Blue ("Joliet on city pattern), 1st card is worth about $30 to $60. There was no Harrah's card in Metropolis. The original 1st card was the Players, tan (with players preferred on front)card in Metropolis. It is worth about $20 to $30. Put it on ebay. I'm am petty sure the card will fetch some bidders.
Regards, The Wizard