Not listed in The Official U.S. Casino Chip Price Guide, the $1 and $20 are. Perhaps an R-6? Small Crown, stands on edge
I only collect obsolete LV chips, looking for $1 Jenny V's, $1 MGM Marina, The Royal $5 (3rd issue), Big Red's $5, Sport of King's $5, The Cowboy, Rancho Inn $1, Pussy Cat a Go Go $5 (3rd), Al's Liquor, The Wheel...