ThunderScan: Turning an ImageWriter into a scanner
I was able to acquire a ThunderScan scanner recently that turned an original Apple ImageWriter printer into a scanner by means of replacing the print head with a scan head. This one looks to be an early version and appears to be complete in box.
It has some rich history as Andy Hertzfeld described at the Folklore Website here: http://www.folklore.org/StoryView.py?story=Thunderscan.txt
Here are some pics: