Hi, the maker's mark IK with or without two dots is for Jacobus Kamphuis, registered in Leiden 1786-1829, year letter O for 1796. The lion rampant, lost his crown in Leiden during the French occupation. See Leiden:
viewtopic.php?f=5&t=32028#p80360Jacobus Kamphuis used maker's mark IK 1786-1811 and K in lozenge (French style) 1812/1829.
Peter