It should be a late 50s Small Stamp, SSB variant.

[img]http://black.net.nz/cym2013/50s.jpg[/img]

You can rule out all the other stamps on various grounds. Not a Trans Stamp because the TURKISH CYMBALS isn't close enough the the ZILDJIAN, and there are dots in U.S.A. (among other things listed on my site)

[img]http://black.net.nz/avedis/images/trans-14-stamp.jpg[/img]

And the other thing you need to rule out is the Large Stamp Type 3, which also lacks the 3 dots in a triangle.

[img]http://black.net.nz/avedis/images/Large-no-dots.jpg[/img]

That one is taller than the late 50s Small Stamps. 1.25" for the Small Stamps and 1 7/8" for the Large Stamps. But you can also tell them apart from the pattern of the bold elements. Also the Large Stamp Type 3 is almost always missing the top portion. Yours has the top portion intact which tells me it is the B variant of the Small Stamp, and that it isn't going to be the Large Stamp Type 3.

[img]http://black.net.nz/avedis/images/SSA.jpg[/img]

[img]http://black.net.nz/avedis/images/SSB.jpg[/img]

I'm still working on some other techniques which allow a beginner to tell if a particular stamp impression is a Large Stamp Type 3 or a Small Stamp A. The bold pattern works. If the AVEDIS is less bold than the ZILDJIAN and the Ottoman section it's a Small Stamp, if the whole stamp is even in terms of bold/not bold then it is a Large Stamp.