Your mark appears to be the real thing, another way to tell is the weight. Fakes are heavier, Real Prussia is thin and very delicate, almost seeing right through it in sunlight. You can learn more on the website RS Prussia.net and About.com. Your bowl is still worth around $100.00 in perfect cond. Elaborate decorations and portraits can be worth lots of bucks.
I have many books on RSPrussia including all Kovels books. None of these bowls have a pattern name, just simply flowered bowl. I need to see the stamp and I don’t see any gold trim Usually bowls plain and simple like this are around $100.00. These are also reproduced and many fakes out there. RS Prussia dates from 1889-1921.