A capable Janbiya - the specifications suggest it's genuine Zarraf (based on visual inspection).
The head (handle): A solid cubic shape, warm blonde color. The handle allows light to pass through when tested with a flashlight, revealing fine internal veins and a "sikka" (groove). All these specifications lead me to believe and strongly suggest it's natural, genuine Zarraf. The sale is based on the buyer's inspection and judgment.
The basket (blade): An old and full Hadrami basket, the "khalal" (ridge) is prominent and clear, its knife is well-crafted and its edge is sharp.
Accessories: A clean Najrani leather sheath (asib), and a wide, embroidered belt fully equipped with silver "halaya" (heels).
Conditions and Location: The piece is complete, and the sale is by auction and inspection. The expectation is high that it's Zarraf, but inspect it with experts and examine your purchase thoroughly before paying. Location: Bisha.