Ottoman matchlock examples.

[estcrh]

Originally Posted by Pukka Bundook

Eric,

Yes, this is the later "Damascus" style twist.
The earlier types were a stub -iron twist, as shown below;

Richard.
Manouchehr M. has some wonderful photos of Persian arms in his book when published, and some very nice photos in his series on Persian arms in Classic Arms Magazine.

Richard, here or some detailed examples from the images I posted of Ottoman matchlocks that seem to be of this type or am I wrong.

[Pukka Bundook]

Not wrong Eric,
These are beautiful examples of what we in the west would call a stub twist.

(stub twist, as the preferred material was old iron horseshoe nail stubs)

I have a few old guns with "Twisted stubs" or "Stub twist" stamped on the under-side.