In 1972, Ajman issued stamps featuring military uniforms in sheet format. There were three image identical sheets, two smaller ones with yellow and green shaded background, one larger with white background. All sheets included a stamp with a Northern Vietnamese uniform.

There are yellow sheets with this stamp blackened. It is assumed that there was concerns, that the sheets would not sell well in the USA since they were at war (Vietnam War) with North Vietnam at the time. The green and white sheets are not known to have the stamp blackened.

Left: Uniform of North Vietnam in yellow shaded sheet

Right: Uniform of North Vietnam in green shaded sheet

Yellow sheet with blackened stamp