I'll go for either Prince Otto Windisch-Gratz, the grandson-in-law of Emperor Franz Joseph, or Prince Franz Joseph Windisch-Gratz, Emperor Franz Joseph's great grandson. If you check the Double Gun Journal volume 17, issue 2 (Summer 2006) there is an article called K&K Hoflieferanten written by Felix Neuberger. In the article there are photos of a brass plate on Prince Otto's Johann Springer double rifle case that has the identical crown over a monogram with the W. There is also a O intertwined with the W. There are also photos of Prince Franz's Johann Springer drilling which also has the identical crown over FJW in block letters. Not definitive, but I think they were the only Princes of that time period of the House Windisch-Gratz who would use the W and were royal.
Well, maybe not Franz Joseph, he was born in 1904 so he was probably too late to be the owner.
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