Glancing at your pics I can't tell for sure whether we're talking about 15" Hats from the Black Label period or the reissued ones (with the red ink model designation at 3 o'clock removed). Six digit serial numbers would mean originals, 8 digit serial numbers would mean they are from the small number of reissue 15" that Paiste has done.
Black Labels are relatively rare. If you have a look at my ongoing research I've recorded only 4 15" Black Labels out of 40 all up. That's based on plain ones not the Sound Edge ones (you may need to scroll to the relevant section -- and scroll left if the column of labels doesn't show)
http://black.net.nz/cym2011/pcalc2.pdf
Since the Black Label sample is so small (4) the price estimates aren't going to be that well estimated. But if you extrapolate based on the whole 40, I'd say an expected eBay price of $300 plus or minus $100 is what you would expect. So $200 is a great price if they are in good shape.
If they are reissue ones I can't say because there haven't been any 15" reissue sales. But I'd still say it is a good price.
If they don't please you should be able to move them on without taking much of a loss. But...
All of these are prices in USA dollars, and although I include as many European sales as I become aware of my coverage of European pricing isn't as good. I've never been able to get consensus on the relationship between expected prices in the USA vs Europe (or Australia and New Zealand where I am). One of the interests I had when I started the research was getting to grips with differences in pricing in different regions, but due to changes in eBay policy over the years it is getting harder to get good info on where cymbals are sold from and (more importantly) where they are headed to. I also haven't seen consensus on whether used Zildjian prices in Europe are relatively higher than Paiste prices are (and vice versa in the USA). People call it both ways, but there is inadequate discussion of what kind of standardization for currency differences and cost of living is being implied, and just how many sales they are talking about. So far I appear to be the only one who has thousands of data points and makes the data freely available.
You can read more via my signature. The link I gave above is just a direct one to one analysis table.