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The new uniform regulation of 1798 introduced a new headwear for the line infantry. This new headwear consisted of a black laquered leather helmet six and a half inches in height. It was topped witht w a wool crest of black over yellow, runing from the top to the back. It was reinforced at the sides by four leather round bands.

A large brass plate was placed at the front of the helmet. The Emperor's Francis II cypher was embossed on it.

Later the front brass plate's cypher was changed to "FI" when Francis assumed the title of Emperor of Austria.

Source: Philip Haythornthwaite