A collection of four Chinese overlay Peking glass brush pots

A collection of four Chinese overlay Peking glass brush pots, 20th century, comprising: one with geese in a lotus pond in yellow, green, blue, and purple against a clear snowflake ground, four-character Qianlong mark, 12.3cm high, one of hexagonal form, decorated with birds and flowers in blue against a red ground, four-character Qianlong mark, 12cm high, one of square form with cranes and fruiting peach trees, seal mark to base, 11.2cm high, one with goldfish in brown, 12cm high (4)