It's a 17th century Turkish dagger...NOT!
http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT
Actually, it's a naval dress dirk, probably British, circa 1805-20, made in the Arabic styling of the period. After the Barbary Wars and the Egyptian Campaigns, naval items in the U.K. and America began to take on the so-called mameluke styling.
Here are a few more I found online-
www.robertfinan.co.uk/images30042005/101.jpg
www.robertfinan.co.uk/images30042005/105.jpg
www.robertfinan.co.uk/images30042005/107.jpg
www.robertfinan.co.uk/images30042005/106.jpg
Just thought I'd share it with the Forum as it is an unusual form and I stumbled on it quite by . Thanks-
Mark