In a deck of cards why does the king of hearts have no mustache?

The King of Hearts is often depicted without a mustache to differentiate him from the other kings in the deck, particularly the King of Spades and King of Clubs, who both have facial hair. This unique design choice gives the King of Hearts a more romantic and gentle appearance, aligning with his association as the "Lover" king. Additionally, the lack of a mustache may also have been influenced by historical printing techniques and artistic conventions of the time.