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Postal Flags (Taiwan)

Background
Postal Flag (since 1956)
Postal Pennant (since 1956)

See also:

Background

Green flag with five thin white wavy stripes and over them near the hoist a white ring containing an ideograph.
It is not clear from the caption in Flaggenbuch (at least to me) if this was indeed an ensign used at ship's stern, or is it maybe a flag used on land by post authorities. The total height of the white stripes equals 1/4 of hoist, and the distance from the topmost of the white wave to the top flag edge is half that width. There are five full waves, with the wave-top at the edges. The ring is set with center a point of the second wave-top (counting the hoist edge as the first).
Green triangular pennant with five wavy stripes along the middle and ring with ideograph near the hoist. The design of the stripes and ring is equal to the postal flag above, but is set along the center of the pennant. I speculate that this pennant was used on ships (maybe on mast at port side) to indicate mail carrying ship that would otherwise use appropriate ensign at the stern (e.g. merchant ensign). If so, then indeed there would be no need for previous flag to be used as ensign.
Željko Heimer, 9 February 2003

For the Postal Pennant the corners at the hoist are at 76.5 degrees, while the corner at the fly are at 27 degrees.
Miles Li, 17 May 2014

In "Postal Flags of East Asia" (Flag Bulletin No. 189, September-October 1999), Dr. Robert M. Spaulding dates the flag from 28 February 1935. The flag was manufactured in 3 sizes:

Supervisory Bureaus - 1.6 meters by 2.4 meters
First class post offices - 1.28 meters by 1.92 meters
Second and Third class post offices - 0.96 meters by 1.144 meters,

The pennant is in the proportions of 7:15 and used on postal vessels.
The central mark is the ideograph yu.

Postal Flag (since 1956)Postal Flag (since 1956)

image by Miles Li, 17 May 2014

Postal Pennant (since 1956)

image by Miles Li, 17 May 2014