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I don't think that it is safe to say that because companies advertise "FPL-53" and not "S-FPL-53" the glass is not the real thing. My own Stellarvue advertise FPL53 (And who would go to the bother of extensive hand figuring of cheaper alternative glass to sell in quite expensive "Premium" refractors that people are bound to performance test?) and a quick search took me to a page on an Explore Scientific scope advertising an "Ohara FPL-53" element with a direct link to the S-FPL-53 spec PDF on the Ohara website.
You would probably be wary of a Chinese made scope at a very competitive price that just says "ED" glass though.
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