The decoration on these dishes is very auspicious. The five bats (wufu) in the center represent the Five Blessings - long life, health, wealth, love of virtue and a peaceful death. The iron-red bats on the exterior above the waves and rocks represent the wish, 'May your blessings be as deep as the Eastern Sea (furu donghai).
A similar pair of dishes, also of Yongzheng date, is illustrated in The Tsui Museum of Art - Chinese Ceramics IV, Qing Dynasty, Hong Kong, 1995, pl. 136. Another dish in the collection of the National Palace Museum is illustrated in Good Fortune, Long Life, Health, and Peace: A Special Exhibition of Porcelains with Auspicious Designs, Taipei, 1995, pl. 101, no. 27. See, also, the pair of similar pattern sold in these rooms 30 March 2005, lot 413.