Disappointment! I finally got around to opening this machine and not only DOESN'T it have a Hyperdrive inside, it has a Mac Plus motherboard and the case bucket was hacked to make it fit. :'(

On the bright side, I can restore it using the 512k board that I bought recently with the MacSnap upgrade.

Even without the Hyperdrive, I still got this machine and the replacement motherboard for such low prices that they're still worth having. ;D