Arabic blade with makers mark? Help needed

[erikscollectables]

Who can tell me what this blade is?
A recent amateur handle was added so I did not include it in the photo (it only distracts from the blade)
One side has a double groove the other a single.
Strong curve and what I think is a makers mark?
Seems arabic to me?

Any ideas on what kind of blade it is, age etc?

Many thanks for your help and input in advance, Erik.