From what you've posted, it looks fine. I like to call this dial variant the "Pac-Man" dial, and yes, there are many known, authentic examples.
You should know that if there is an original crystal installed, it will likely need to be changed, as they are prone to hazing and micro-cracks. If you have to change one of these crystals, you'll need a very motivated watchmaker who is willing to manufacture a tool to open the crystal retaining ring to get it out. NOS crystals of this double thick, dive tite variety are impossible to source. Not a deal breaker, but know what you're getting yourself into if you're not buying from a dealer who has taken care of these details.
FWIW, there have been quite a lot of Grenchen Nivada watches coming out of Peru lately. Aside from being over-worked, they don't appear to be fake, but these are relatively rare pieces, so the frequency that they've been coming to market (eBay) is a little disturbing.
Always buy the seller, not the watch.
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