Almost all pieces are unique. The signature of Martine Knoppert consists of a letter M and a K (rotated) in a square.
Below the square ‘10 (in 2010). In recent years I have been numbering per object under the square, for example: 1620 is the 20th signed object from 2016.
Jewelry and small pieces are not always signed. From 2019 they often have a card with the MK art logo.
I usually make my glass pieces myself. Occasionally I outsource the making of a steel frame. Since I engraved, there has been an exception to this rule. A number of grails were blown by skilled colleagues in that area. Read more about it: Stories around Grails (in Dutch).
Part of video from Open ateliers Duinoord and surroundings The Hague edition 2018. During these Open studio days, it was filmed by Haagsedingen.nl In the video you see successively Martine Knoppert, Ingrid la Haye and Nicky Konings.