Dutch Delft monteiths are quite rare. There is no trace of another pair in literature or museum collections. Individual examples do exist but hardly in this shape.
Each marked CK above a 3, 2, and 14, for Cornelis Koppens, De Metaale Pot, 1724-1757.

For another Dutch Delft monteith from De Metaale Pot, Lambertus van Eenhoorn, 1691-1724, see Museum Prinsenhof Delft Nr. LM 2125