You have to understand that during these years what
Islamic and Turkic dynasties did is to imitate
Byzantine coinage. Especially pre-reform Umayyad coppers were like this. One other thing is that most copper coins are somewhat unofficial
types which were struck locally rather than centrally. Therefore once
Islamic dynasties conquered an
area which was previously
Christian, it was of utmost importance to the conquerors to maintain the local
standard. Examples of this can be found throughout all
Ottoman regions. For example the main
denomination of the
Ottoman heartland was the Akce and 10 Akces made an Onluk which just means "piece of ten". However, in cities like Mardin, Aleppo (Halab),
Damascus (Dimashq or Sham) 10 Akces made a Dirhem which is consistant with Umayyad, Abbasid or
Fatimid coinage. The
Dirham is not a Turkish invention but an Arabic. Other examples are
Ottoman coins struck in Transcaucasia which is predominantly Persian. The Abbasi survived there since the Safavids.
Moreover if you look at pre-reform Umayyad coins of Arab-prototypes , so to speak,
Arab-Byzantine, Arab-Armenian, Arab-Sassanid and Arab-Bukharan
types, you will that the coins were locally imitated but were bearing
Islamic elements on then as well as other languages.
So the Artukid or actual name is Artukogullari, a Turkish principality did this too. If they minted coins which was
Byzantine before they imitated this kind of coins. The same with
Roman,
Seleucid and so on.
Sayles and
Spengler is absolutely outdated in this coinage full of mistakes. Recent Turkish publications are much more up to date which are soon to be availabe in English as well.
I have to agree with Howard that it has nothing to do with bool lines. However the Seljuqs are not descendants of the
Romans and they do not claim this as well. They are considering themselves as i-Rumi Fatiha which means the conquerer or the Rum. Rum in this context means everytihng Hellenistic and
Roman (so this culture) kind of like we use "Western" today. Rum can also mean
Anatolia or in todays meaning just
Greeks or Greek on
Cyprus. Fatih
Sultan Mehmet II of Muhammad II proclaimed himself
Kayser i-Rum which means the
Caesar of Rum.