This Mizpah chip appears to be from the "imitation" series as shown in TCR (N4289) but it is labeled an error chip as the town is mispelled (TOHOPAH - not TONOPAH). Are the chips in your imitiation series labeled correctly to Tonopah>

http://cgi.ebay.com/Error-Chip-Mizpah-Casino-TOHOPAH-5000_W0QQitemZ6280667066QQcategoryZ63756QQrdZ1QQcmdZViewItem