Let's first turn the seal so we can read it:
the male coat of arms has as motto: De Par Dieu,
and shows on the shield a fess and three lion heads caboshed,
and has a crown with 3 fleurons and 2 pearls
the female coat of arms has as motto: God Zorgt Voor De Zijnen,
and shows a planted, maybe fructed, tree with a bird in the top
and a bird in flight above
now we look into the archives of CBG,
the Dutch Central Bureau for Genealogy in The Hague,
and find:
for the family Van Der Horst,
one part is the same
and:
for the family Zijnen and/or Van Der Hegge Zijnen
Now we have to find a marriage between a
sir Van Der Horst and a lady Zijnen or Van Der Hegge Zijnen.
The sunbeam on the ladies shield on the wax seal
hasn't brought us light so far.......
