The
type of the Arabic letter used , is from the late
Ottoman or Othman era.
The whole text is:
The trusting in the owner (refers to God as the owner and
king of everything including properties . as all of all ) the
poor ( means
poor man ) Omar bin Muhammed.
الواثق بالملك الفقير عمر بن محمد
The word
poor and some other words is used a lot on stamps and signature at that time as
poor to God , to express humbling.
In other signatures and stamps , they even used the word "Despicable" الحقير