RS Prussia Elegant Floral Pink and Gold Antique Mustache Ceramic Cup

Step back time a time of lavish elegance where mugs were designed for gentlemen to prevent their mustaches from getting in the way of sipping on tea. Elegant, bold, beautiful floral with gold accents on this ceramic mug. I picked this up over 25 years or more ago at an antique shop. It's in great condition. I can't make out anything g on the bottom except an eg