A very rare pair of Weesp figures of seated boys

A very rare pair of Weesp figures of seated boys
1759-1770, blue crossed swords and three dots mark
The white-glazed chubby boys seated naked on rockwork against a spherical ball above a large book, holding a smaller book in their hands together with drapery, one figure executed in more detail than the other, some restoration and loss
16.4 cm. high (2)