Rama IX gold 400 Baht 1971 (BE 2514), KM-Y93, NGC MS-64. AGW 0.2893 oz.   400 บาท

Mintage maybe 49,584 .

Graded Mint State 64 by Numismatic Guarantee Corporation

Celebrating the 25th year of the reign of Bhumibol Adulyadej, titled Rama IX.
He was King of Thailand from 1946 until his death in 2016. His reign of 70 years and 126 days is the longest of any Thai monarch, the longest on record of any independent Asian sovereign, and the third-longest of any sovereign state