Wine Jar ( Ewer ??) with Motted Dripping Brown Glaze

[Lee Seng Kong]

Kindly allow me to introduce myself. I am S K Lee, 66 years old and antiques/collectibles has been my hobby for more than 30. Recently retired and hence, found time to join this forum.
Bought this piece in Sarawak (Borneo Island).Photo -03 appears to show deterioration of the glaze, however on closer inspection, it is a firing defect.  Appreciate anyone who can  share your knowledge.

Thank-you.