I was reminded of a jambiyya Artzi sold a while ago:
http://www.oriental-arms.co.il/item.php?id=4499
His description from the site:
A fine and very good quality Arab Jambiya dagger from Oman, in the royal style known as Saidi . This Dagger was presented by Qaboos Bin Said Sultan of Oman, to the British officer Col. David George Arthur Holt, in recognition of his service in the Oman Military forces. It has a 8 inches curved and dual edge blade with a pronounced central rib. The hilt is made of Rhino horn in the classical “I” shaped, decorated with many small silver filigree pieces. The scabbard is “L” shaped covered with fabric. The belt attachment is made of complicate arrangements of 7 silver rings and twisted silver wire. All scabbard and hilt fittings are silver chased in a typical design. This item comes with its original heavy silver buckles. Total length 13 inches. Very good condition. Documents related to the military service of Col. Holt are included.