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Prime Minister (Thailand)

Current Prime Minister flag
- Vertical variant
Prime Minister 1939-1979
Prime Minister 1939 (according to Flaggenbuch)

See also:

Current Prime Minister flag

5:6 image by Phanuwit Woonchoom, 5 August 2020

5:7 White flag with red state seal topped with yellow Thai royal crown. Similar flag is shown also for Prime Minister, but was apparently abandoned in 1979. Source: Album 2000

Željko Heimer, 30 March 2003

From the 1979 Flag Act:

Section 43. Flags Showing Positions in General are: (3) Prime Minister Flag which is rectangular shape with 5 parts width and 6 parts length and a white field; in the middle of the flag, there is a circle with double circumferences; in the middle of the circle, there are charges of the Constitution surrounded by radiance, enshrined upon 2-tier pedestal above a low table, and there are charges of Rajasiha and Gajasimha standing in a leaping position facing each other on 2 sides; these charges are red and are underneath the yellow charge of the Phra Maha Mongut;

Zachary Harden, 5 August 2020

Vertical variant

image provided by the Royal Thai Government, 27 January 2020

In a January 2020 address to the people of Thailand, Prime Minister Prayut Chan-o-cha was flanked by the national flag and his positional flag. It is of curious note that the office emblem was turned upright when being displayed on this flag. It appears to be a recent creation, as evidence of the flag only exists back to 2019.
Zachary Harden, 5 August 2020

Prime Minister 1939-1979

5:6/5:7 (?) image by Eugene Ipavec

From the Singha Beer source:

The Prime Minister's Flag (B.E.2482) [1939 AD]
This is a white square, flag with a base measuring five-sixths of its length. In the middle stands the official state seal of the Prime Minister flanked by two creatures from Thai mythology – the "Kojasri" (a lion with an elephant's trunk) to the right, and the "Rajasri" (Lion) to the left, guarding a red chalice symbolizing democracy. Above hovers the Chakkri Crown in yellow.
This flag was first created following a special Royal Decree concerning flags, in B.E.2479 [1936 AD] – a turning point in the country's history, when Siam became a constitutional monarchy. The flag seen here was first used in B.E.2482 [1939 AD] and has been in use until B.E.2522 [1979 AD].

Santiago Dotor, 05 November 1999

Prime Minister according to Flaggenbuch, 1936(?)-1939

5:6 image by Klaus-Michael Schneider, 07 Nov 2007

Flaggenbuch 1939 shows a white flag like the Regent's one with a 5:6 ratio, a centred escutcheon, no garuda and the two supporters described above – Kojasri and Rajasri – as Ministerpräsident. This relates better in some way to the above description, as the Singha Beer source image shows no "official state seal".
Santiago Dotor, 20 January 2000

Source: Flaggenbuch; edited by HQ of German navy; Berlin 1939, reprinted Zwickau 1992; p.161
Klaus-Michael Schneider, 07 Nov 2007