An interesting wafer

I picked up this interesting wafer at the silicon valley electronics flea market. So far as I can guess, these are some sort of image sensors. The manufacturer has cleverly divided the wafer up to make three different sizes of sensors at the same time-- only three of the large ones, and many more in the two smaller sizes.

So, before I pull out the microscope and look for brand names, can anyone guess (or identify) *exactly* what we're looking at here? For scale, the wafer is about six inches across. A few more pictures follow.

This photo was taken in direct sunlight. The diffraction pattern shows that all of the devices have a high-density microscopic structure that's basically an equally spaced square grid-- obviously consistent with image sensors. And it looks neat.

Here's a second view up close-- you can see the different sized devices and a test pattern area. The pictures link to flickr, where full-size images are available.

Update: I've found the following part number on the three large sensors: KAI-4300, which then appears to be a Kodak product, in the KAI line of Interline CCDs.