Hi Kirils.
Nice oil&vinegar cruet set and I believe you are right MK (conjoined) under a crescent moon (deformed) for; Johannus Mattheus van Kempen II born in Utrecht 1792-07-22, died in Utrecht 1831-09-05. Registered in Utrecht as silversmith during 1816-1831. Son of Johannes Mattheus van Kempen (I), brother of Pieter Johannes van Kempen, father of Johannes Mattheus (III). Could you please check the set for a date letter and assay office mark and if found show us an image?
For information about the van Kempen family of silversmiths see:
http://www.925-1000.com/forum/viewtopic ... 590#p70305
Peter.