Portmeirion Botanical Floral Butterfly Vintage Mug Set of 2

These beautiful mugs are in excellent condition. On the handle of the blue flower one, there is a tiny mark, in a golden tone. Circled in photo. It looks like a printed symbol, possibly. Each bottom has a stamped 33, also circled in photos. Very clean and no chips. Made in England. Beautiful little blue and purple flowers and butterflies on one and purple and yellow violets on the other. Thank you!