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Army Rank Flags (Thailand)

Marshal 1912
Commander-in-Chief of the Army (1938 flag)

See also:

Commander-in-Chief of the Army (1938 flag)

5:6
The blue border matches the original source's background and is not part of the flag
from the Singha Beer source

From the Singha Beer source:

The Flag of the Commander-in-Chief of the Army (B.E.2482) [1939 AD]
This flag resembles the "Trairanga", with the base [sic — probably "width"] measuring 5/6 of its length. [Similar to the Naval Jack, removing anchor and with clockwise and more detailed Chakra.]

In the middle stands a Chakkra beneath a yellow crown. The flag was first created in B.E.2479 [1936 AD], but was later changed to the version seen above, following a Royal Decree (Issue 2) concerning flags; issued in B.E.2481 [1938 AD]. The design of the flag currently in use, however, is a little different.

The description seems to imply that the ratio is 5:6. The image however shows a 2:3 flag like the regular Trairanga. In Flaggenbuch 1939 it appears as a 5:6 Trairanga with only a large, centered, white Chakkra, its diameter being 5/6ths of the hoist.

Santiago Dotor, 5 November 1999

Marshal 1912

The blue border matches the original source's background and is not part of the flag
from the Singha Beer source

From the Singha Beer source:

The Marshal's Flag
This is a red flag with the Royal Sceptre crossed by sword in the center, above which stands a flaming Chakkra and the Greater "Mahapichai Mongkut" Crown.

The flag, first made its appearance in 2455 [1912 AD] during the reign of King Mongkut, was used by a Marshal in to Army. Since then, however, use of this flag has been discontinued.

There is some mistake here, since King Mogkut reigned 1855-1868.

Santiago Dotor, 5 November 1999