Len, from what I understand is that "Julius Voos Fabrique D'Armes Solingen" made swords, were commonly seen in the Ottoman Imperial Army from the 1876 period onward (though they could date earlier to that).
The Australian War Memorial collection : RELAWM15848 - Turkish Officer's Sword and Scabbard http://cas.awm.gov.au/item/RELAWM15848
has a very similar sword to this one made by "Julius Voos Fabrique D'Armes Solingen". The AWM one was "This Turkish officer's sword was captured during a search carried out by British troops for arms in Baghdad. The city was quartered into small blocks and each Section of British troops were detailed to search homes within its boundaries."
The Imperial War Museum, London has one as well. # WEA 1192 http://www.iwm.org.uk/collections/item/object/30001035
attributed again the Ottoman Turkish WW1
Here is another version - http://www.alliance-encheres.com/fr/vie ... dlot=55571
I would put this sword into the 1876 period. And given that there were Austrian and Hungarian officers serving in Ottoman Turkey since the 1850s, it could be linked to these officers. The Imperial Army and Navy swords became more standardised, and these are illustrated in the publication: Askeri Müze ve Kültür Sitesti Komutanligi. (1986) Osmanli askeri teskilat ve kiyafetleri: 1876-1908 [Ottoman military organization and uniforms] Yayinlari. Use of swords with 'low' basket guards (without the star and crescent badge) - as with yours - was authorised for officers - staff, regimental colonel, adjutant-major, as well as Artillery lieutenants (upwards).