Are E lenses the sames as MC lenses?

I recently ordered a used 50mm f2.8E lens for my ETRS, and that was what I expected to receive!

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The advert said 50mm f2.8 E and the supplier's invoice says 50 f2.8E but the lens itself is marked MC, unlike my 75mm lens which is marked EII.

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Presumably MC stands for multi-coated.

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Info elsewhere on this site, and other sites on the Internet, seems to suggest that there are 4 different lenses (ie MC, E, EII and PE) for the Bronica.

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Should my supplier have sent me an E lens? Have I been conned, or am I being paranoid?

Update ...

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Several dealers have told me that all 50mm Bronica "E" lenses were marked "MC", and that this lens has since been replaced by the "PE".

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I'm grateful to them for this clarification, and to my supplier MXV for giving me a full refund. I have now bought a "PE" lens.

<p>E MC are the original ETR lense.<br>

Some of them was replaced by the E II lens. I believe only the E II 75mm was made.<br>

Then the full line of PE lenses, including the zooms. They are excellent.</p>