This shape of this ewer derived from German or Dutch stoneware or faience and probably copied from the models supplied by the VOC.
For similar examples without mount, see:
Christiaan J.A. Jorg, Fine and Curious, Japanese Export Porcelain in Dutch Collections, (Amsterdam, 2003), p.159, no. 177. (Groninger Museum, Groningen)
Oliver Impey, Japanese Export Porcelain – Catalogue of The Collection of The Ashmolean Museum Oxford, (Amsterdam, 2002), p.47, no. 17. (Ashmolean Museum, Oxford)