As I said, I've got a couple of Mac Pluses with the model number M0001AP. For interests sake, I also have a couple with the model number M0001A, yet they all have 240v PSU's (which as we all know the "P" designates the international power supply). Another interesting point, the M0001AP's obviously have their model number on the back label, but also on a second label as the end part of the serial number. My M0001A's don't have the model number in the serial number. Don't know what this means or if it's of any significance. Anyway, evidence of the M0001AP regardless.

The Classic without the hard drive (I've always assumed these to be an educational/school version) is M0420. My hard-drive'd ones are all M1420's. I've got a few M0420 Classics and none have hard drives, all have a SCSI terminator (?) plugged into the logic board SCSI socket, looking pretty factory.

Pics below.