The board looks like an interface for a Kodak/Sayett DataShow projector pad - I installed quite a few of them in Mac SEs and SE/30s in the day.
The DataShow was basically an LCD display panel in a box with a glass window on both sides. It was placed on top of a standard overhead projector to display the Mac screen on a projector screen. They were popular as a cheap alternative to the megadollar data projectors.
A quick Google found a piccie of one:
http://www.recycledgoods.com/item/17642.aspx