This Sayf Yamaani has resurfaced from the client who procured it here many years ago and it is now in Australia.
I occasionally see these hilts with a zig zag decoration as shown accompanied by a couple of parallel lines simply placed below. The hilt showing under the leather grip is hexagonal and of two parts riveted through a wooden core.
The Example in The Al Ain Museum is shown to compare the zig zag on the hilt and to note a possible use of decorative anchor points for adornment in this case two silver studs....often empty.