Hi Norman,
To me, it looks like a Ottoman Greek dagger. Having said that, it is not a typical one because most of them have a more Bichaq-like shape and the silver engraving is done with deeper relief, more like the one discussed here
http://www.vikingsword.com/vb/showthread.php?t=10027
In my mind, the style of decoration is not Persian but shows European influence, and the all-silver-plated look is certainly not Persian, but Greek-Ottoman. But I might be wrong, of course.