Unless there is a proof of service, the term "service" in eBay listings is just a blatant lie.
Yes, original black dial Omega Seamasters certainly do exist, but in far less number than their silver/white dial counterparts, as they weren't in fashion back then. Here is a couple of examples that I have owned.
They certainly are in fashion now, which is why black is the go-to color for redialers. You can assume that a great percentage of the black dial Seamasters on eBay and Chrono24 are redials.
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