The Hongkong and Shanghai Banking Corporation, $100, 31.3.1975, serial number 1000000WP, (Pick 185d), PMG 64 Choice Uncirculated. The 1975 issue runs from 800001WP to 800000WT and only four notes bear the 1 million serial number, extremely rare.
Estimate: $6,000.00 - $9,000.00