HEINRICH BLOCK.

The 1957 source shows a white–green–white horizontal triband, approximately 1:3:1, with red “HB” in a central white lozenge. The FOTW rendering makes “B” taller, but Rosanoski attributes that to distortion of the scan: the letters are equal in height, with the break at the bottom of “B” curving below the base. B822 represents his reading of the original.

The US Navy version is close to B822, but its “B” has a slightly different base curve.

Brown 1971 gives a green flag with the diamond extending throughout and ordinary red “HB”, without a break at the bottom of “B”.

Mitchell’s funnel uses letters like B234, without the separated base of “B”.