(เครื่องราชอิสริยาภรณ์อันมีเกียรติยศยิ่งมงกุฎไทย; RTGS: Khrueang Ratcha-itsariyaphon An Mi Kiattiyot Ying Mongkut Thai / Mongkut Siam). Instituted in 1869. Multi-piece construction, in silver gilt with red and navy blue enamels, unmarked, measuring 53.5 mm (w) x 88 mm (h) inclusive of its crown suspension, chipping and crazing evident in the blue enamels on the obverse, light contact overall, traces of gilt remains, without sash, fine.
Footnote: The Most Noble Order of the Crown of Thailand was instituted on December 29, 1869 by King Mongkut Rama IV and is awarded in five grades: Grand Cordon, Knight or Dame Grand Cross, Knight or Dame Commander, Commander, Companion and Member, plus a VI Class Gold Grade and a VII Class Silver Grade Medal.

