I notice The Chip Guide just added E9131 to their database and is asking for a scan.

This catalog number is listed in TCR under Monte Carlo in Reno, but as a 1950's chip while the Reno casino didn't open till the 70's. It also says "Lake Tahoe" in the description field so this should probably go under a different club. I don't know this SMKEY chip, but it appears out of place in the Reno Monte Carlo. Maybe the Crystal Bay club just before the Reno category in TCR?

Jay Sands, do you have history on this listing?