Ahh, good for you, K!
I kinda suspected it would have "black widow" grips since they'd look good with nickel. Assuming they actually are worth $250, you may have bought a $700 shooter after all which fits in nicely with the norm. The good condition, matching numbers and that you like the finish is all gravy.
Of course Jerry makes excellent points that newbies like us should heed but it's your gun and what really matters is how you feel about it. Maybe later you'll decide to flip it over on the market and get something else. It could surprise you what you'd get for it, there's always a buyer for a nice looking Luger.
I suppose it might make sense to start looking for a VG to excellent 41 or 42 byf with wood grips that cries for those bakelite grips! I guess that's acceptable as long as the piece originally could have had them. My 41 byf also has the original black grips but we're in the minority as most of that era had wood. You'd also have an interesting pair, Salt&Pepper Lugers!
Now that you have your shooter let's hope you find your next Luger easier than this first one. Hey, let's go shootin'