The commemorative jars featured a patriotic red, white, and blue label, a gold crown in place of the usual logo, and a red cap. The spread itself was the classic recipe, but the packaging made it an instant collector's item.

Only 300,000 jars of Ma'amite were produced, making it a sought-after piece of memorabilia from a significant moment in British history. It was a clever and fitting tribute from one British icon to another.

Source: https://en.wikipedia.org/wiki/Marmite#Limited_editions, https://www.wearenotfoodies.com/2012/04/marmite-maamite-diamond-jubilee-edition-review/