But what I don't understand is that the serial has a M0001WP in it...Normaly that would mean that is was a 512K. But the back says that it is a M0001D.

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The serial number and Model number are completely different animals. The model number is essentially badging, but the serial number indicates the actual configuration of the unit. Think of it this way, as the 512Ks rolled off the assembly line, they weren't allocated specifically as an ED, they were all 512Ks ... So the serial numbers were slapped on the case fronts which were attached to the actual computer chassis and assembly, and only the rear cases specified how that Mac would be sold. So all 512Ks that rolled off the assembly line were identical, and only a specific set of buckets badged for educational sales changed the designation of the rest of the Mac, which was otherwise no different than any other 512K. Much more efficient than trying to match front halves and back halves in the assembly room as they came off the line in a different order from each other.