I see this all the time on these forums and I don't understand it. You tell us you bought this German SS badge from a reliable militaria dealer, he had no idea if it was real or not, but it came with some other stuff that apparently was. You apparently did some research and a light test. Now you want this forum to authenticate it and to provide you with a value.
Like I said, I don't get it. If you want to collect German WWII stuff or whatever, then learn about it yourself by building a reference library and by studying known real examples, do the research yourself and take the liability about each piece that you purchase. Remember it is your responsibility to know and understand what you are buying for yourself, not the collector community as a whole. Obviously from your narrative you bought the piece, therefore you must have thought it was real and that the price was good. What if we all came back and said that the back was a repro, do you plan on running back to the dealer and returning it?
Looking at your story, you went to a reliable dealer, great although even as good as any dealer is they can make mistakes. He has a $40,000 collection, well who cares, anyone can amass a huge collection and still not know anything, and have a collection of reproductions to boot. I have two cars in the driveway, that does not make me a car collector. The dealer was not sure if it was real but it came with other real stuff. Red Flag! If this uber reliable dealer is not sure, then perhaps you better back away from the deal, especially if you do not know its validity. If another collector purchases it and it turns out to be real, well then you have just learned a valuable lesson that the other collector knew more than you and you grow from the experience by studying your collecting topic more.
You went home and did your 'research'. Okay, did you go on the internet and look up SS eagles or did you consult your reference library and collection to see if it conformed to other known examples? You did a black light test, great although this test only proves that the materials are not synthetic. Apparently if you have to run to this forum to verify your purchase then perhaps you did not 'research' enough.
Judging your questions which are basically, is it real, how much is it worth and what do we think of it; are ridiculous as you have already determined that the badge was real and a reasonable price at the time you bought it. Why do you need our validation? As well, who cares how much it is worth, are you buying the badge as an investment? If so, then you are not a collector but a speculator. A collector is a person who purchases items because of their interest in them and to form some form of like grouping.
As Cliff stated in his reply, you have to be very careful when collecting anything especially 3rd Reich material. Any collector can get 'burned' but those who go into the game fully armed with knowledge stand a better chance of identifying a purchasing legitimate pieces for their collections then those who simply consult forums after-the-fact.