The maker's mark three leaf clover attributed to Frans Rienks Baardt, born 1601, died 1662/1663, registered in Guild book Bolsward 1614-1653https://books.google.nl/books?id=owk9DQ ... dt&f=false
See page 338
NB; Jan Sjoerd attributed maker's mark(device mark) being X with serif with horizontal line in cross point, born around 1585, entered Guild book Bolsward 1609-1649, died 1659.
See page 318
Gratitude: Jan Schipper http://zilverstudie.nl/
Source: Tussen hamer en aambeeld: Edelsmeden in Friesland tijdens de Gouden Eeuw
author Peter Schoen 2016 ISBN: