The Duchy of Nassau was annexed

Duke Adolph of Nassau sided with the Austrian Empire in the Austro-Prussian War of 1866.
After Austria lost the war, the Duchy of Nassau was annexed by Prussia.
Suppose Austria won the Austro-Prussian War of 1866. What becomes of the Duchy of Nassau?
 
Like the rest of those annexed, it would survive (and in an Austrian win the only one I can really see getting annexed is Hannover annexing Brunswick, though Saxony might pick up the Ernestine duchies) possibly it would gain some territory from Prussia in the Rheinland, but probably not.
 
Not a lot in the short run. It just carries on under the current Grand Duke and his son, becoming joined in personal union with Luxemburg in 1890.

The interesting question is what happens when the male line dies out (in 1905 OTL). The heiresses might be married off to Habsburg Archdukes, but there might be other possibilities.
 
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