Brian: as far as I know, there will also in Paris great Persian exhibition in 2007. There is a chance there will be objects from my museum as well, because I was asked for some of them.
If you mentioned the influence of Turkish helmets on Hungarian and Polish ones, it is worth of mentione, that those were of the conical shape. Some of them were made as a tournament or for parade purposes in Germany as well, just like one from my museum, made in Nurnberg. And by the way - Polish classical hussar zischagge is very similiar to those Turkish helmets presented on your pictures
. But this is off-topic.