Royal Monogram of Vajiravudh "RR.6" (Rama, Ramadhipati 6th), as appeared on the badge of the Ratana Varabhorn Order of Merit.
File:Keten van de Siamese koning.jpg
User:Robert Prummel, original design by HRH Prince Narisara Nuvadtivongse, tracing into SVG format by user:Xiengyod~commonswiki.