P&P--I read this info in an armorer's manual dealing with captured WWII bring-backs, in which the text described the pistol as such. Book title and author escapes me, it was borrowed from a co-worker that now runs a P/I firm and does Glock and SIG armorer work at his home. He is one of the BUSIEST 70-year-olds I have ever known, I'll see if I can run him to ground this week and get a title and page.
The M-1908 has a recoil spring-to-barrel arrangement that fell from favor after WWI--its recoil spring ran in a gallery ABOVE the barrel rather than below as is more common in modern times. There were a number of small pistols of this design from c. 1900 to 1920, and FN had a couple of these as did a lot of other European makers.
My example has professionally-executed armory numbers, believed by the Mannlicher Collector's Association to be police department inventory control numbers. These are seen on the pistol's grip frame. Like a few of my other war toys, I would love to hear this example's history.
Can I independently certify that Princip used an M-1908 in 1914? I only know what I've read, so that's the extent of it. I'll try to flesh this out a bit more, at least get a source name and horsepower. Check yer PMs.