Hear is an Omani jambiya that sold today on ebay and it seems highly suspect to me. The embossing seems to be stamped out the blade for some reason was etched to give it a wootz effect but I can see no pattern and there is no central rib in the blade. The leather is newer looking without any wear. I would place this piece around 1970-80. The jambiya at the bottom also just finished on ebay and to me this one is a true older piece late 19th century. Notice the older style blade good quality silver work and good wear as if it had been carried a long time by it's original owner.
http://cgi.ebay.com/19th-early-20th-...d=p3286.c0.m14
Lew