Islamic/Eastern European Crossguard

[Marc]

Ok, so, just to set the ball rolling, here I put some swords from the Military Museum in Istanbul that are labelled as 16th c. and that allegedly belonged to some of the Ottoman rulers of that time. Sadly, I know nothing about the reasons that may support such attributions (I suppose the inscriptions in the blade may have something to do with it) nor how reliable may they be.
In fact, I'm afraid I must confess I don't know enough about "eastern" swords of this period to really feel comfortable discussing the finer points of the origin of a crossguard typology, but I happened to have these pictures and thought they could contribute to this subject...