Royal Standard of the King of Siam 1891-1897, according to the Flag Regulations for the Kingdom of Siam of Rattanakosin Era 110.
No.1
The Royal Standard
Red; with a dark blue rectangular field in the centre; the latter containing a pedestal of yellow colour with a projection in the middle of the foreground on which stand the Royal Arms, namely: A scutcheon in three division, the upper and larger division of which contains, on a yellow ground, a white three-headed elephant facing the front and representing Northern, Southern and Central Siam; the lower division to the right containing, on a pink ground, a white elephant facing the flag-staff, and representing the Laos States and the lower division ot the left containing, on a red ground, the device of a straight and a crooked dagger crossed, representing the Malay States.
The scutcheon above described in surmonted by the "Chakr-Kri" or "Wheel and Trident," and over all is the Royal Siamese Crown. On each extremity of the pedestal stands a seven-storied canopy or Royal emblem.

This is the Royal Standard of Siam, which is used only by His Majesty the King. It indicates, wherever hoisted, that His Majesty is there, and it must always be hoisted at the main mast of the Royal yacht or Man-of-War.
http://www.t-h-a-i-l-a-n-d.org/siamflag/rule.html (link to image file: http://i54.photobucket.com/albums/g101/apgts/siamflag/rule/rs110p11.jpg )
User:Sodacan (original SVG generated file)