Look at the post by Eftihis:
http://www.vikingsword.com/vb/showth...ighlight=black
The guy in the middle wears a large Qama with a Jambiya-type handle but... the pommel seems to look like an Albanian one ( you know, the diagonal incisions).
Qamas were popular in many cultures:Tirri's book has one from the Arabian Peninsula and I have one from Sudan. The distinguishing characteristic is the handle or other decoration, not the blade: Persians sold trade blades all over.
I am more inclined to think that the steel cover of the scabbard points more toward Iraq/Persia.
Ham, do you have any hard evidence of Trabzon provenance?