It is also not the only use of Stambul. Here is another use of the name Stambul on what claims to be a Made in Turkey cymbal. Diameter 11" and 300g.
In that last picture showing the sig. I'll be damned if that is not made in Turkey. That looks like a K or made by someone that used to work at K.
Not saying it is Made in Turkey,...but it sure does look the roll.
Paiste let Ludwig and SONOR co-stamp their cymbals because they marketed them,...the one you show has no Paiste on it.