The Ottomans bought before ww1 Schneider 75mm guns L16.7
Moreover, in 1912 the Ottoman army captured at Salonika Serbian Schneider 75mm M 1907 A guns (Schneider 75mm P.D. 6). They were assigned to the Chtaldzha Army and fired against the Bulgarian Army in 1913. At the outbreak of the WW1 it seems they were assigned to the II Turkish Army Corps. One of these guns was found in Baghdad in 2003
They also had 75mm Krupp mountain guns:
" In 1910 or so, Krupp sold two types of field guns that fired the 6.5 kilo 75mm shell used by the Ottoman Army - one that weighed 1071 kilos and one that weighed 995 kilos.
This difference in weights was in keeping with the German Army's philosophy of providing horse artillery units with a somewhat lighter field piece that fired the same ammunition as the field piece issued to field artillery units.
The 75mm Krupp mountain guns sold to the Ottoman Army used a shell that was much lighter (5 kilos or so) than that fired by the 75mm field gun. The velocity of this shell, moreover, was much less than that of a field gun shell."
see thread here:
https://forum.axishistory.com/viewtopic.php?f=80&t=109530&start=15 you''ll find a lot of precise info on Ottoman artillery.
also here
https://forum.axishistory.com/viewtopic.php?f=80&t=139398&p=1213599&hilit=75mm#p1213599 and here
https://forum.axishistory.com/viewtopic.php?f=80&t=110105&hilit=Schneider