I believe the Edwards 270-SPO is still being manufactured by GE as well. If the 270-SPO was discontinued when the 278B came out (which I don’t think happened) then it would match the description.
Someone on the forums a long time ago claimed that the Faraday F1GG is still being manufactured. However, I tried to find information on this and didn’t come up with anything, so I’m guessing it’s a rumor. It would be cool if this was true though.
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No, the 270-SPO was never discontinued because of the 278B. It was actually more popular and more durable (at least here in Canada.