The anonymous painting, described in a statement by the Department for Digital, Culture, Media & Sport (DCMS) on Friday as "extremely rare," is valued at £272,800 ($362,060). The block lasts until March 9, 2022 after when it could leave the country unless a UK buyer purchases the work.

Titled "Allegorical Painting of Two Ladies, English School," the painting presents a Black female sitter and her White companion as counterparts, as they sport similar clothing, hair, jewelry and makeup.

It was uncommon for a Black female sitter to be portrayed in a painting in the 1650s, especially an adult, as opposed to a child in a position of subordination, sparking an "important debate about race and gender during the period," according to the press statement.

The painting is also unique because both women are shown wearing similar "beauty patches," a kind of facial cosmetic adornment which was in fashion in the 17th century. The patterns on their faces marked "a sin of pride," according to the statement.

The style of the work correlates with popular woodcut prints at the time, meaning the composition is allegorical and is linked to satirical verse, sermons and pamphlets.

UK Arts Minister Stephen Parkinson, known as Lord Parkinson of Whitley Bay, decided on the export bar with the help of the Reviewing Committee on the Export of Works of Art and Objects of Cultural Interest (RCEWA) -- an independent body that offers impartial advice on objects that are of national importance to the country.

"This fascinating painting has so much to teach us about England in the 17th century, including in the important areas of race and gender, which rightly continue to attract attention and research today," Parkinson said.

"I hope a gallery or museum in the UK can be found to buy this painting for the nation, so that many more people can be part of the continuing research and discussion into it," he added.

"This anonymous painting is a great rarity in British art, as a mid-seventeenth-century work that depicts a black woman and a white woman with equal status. It is not a portrait of real people, as far as we know, but the inscription reveals that it is in fact a sternly moralising picture that condemns the use of cosmetics, and specifically elaborate beauty patches, which were in vogue at the time," RCEWA members Pippa Shirley and Christopher Baker said in the DCMS statement.

"Although not distinguished artistically, its imagery relates in fascinating ways to contemporary stereotypes of women, fashion, and, through the juxtaposition of the figures, race.

"The fact that it has only recently emerged, and only one other related painting is known so far, and that it could be used to explore important aspects of black culture in seventeenth-century Britain, makes it particularly important that it remains in this country so that its meaning can be widely studied and understood."

Further research could show how the picture connected with contemporary artwork and texts and the purposes for which it might have been created and used, Shirley and Baker added.