Each module has 7 elements/pixels, see picture on Ebay. I am selling 30 modules as a set, which will give you 6 lots of 5x7 pixels, enough for 6 characters. So it's actually a dot matrix of 7 x 30 pixels. Would make a factastic clock, with the characteristic fluttering sound as the digits change.
Actually we are still going through the pile, there are some PCBs about the size of A3 paper for using these displays as a big matrix, and a huge demo display the size of a wall that is so big it got left against the wall when some pallet racking was put up, so we can't even get the crane in to lift it out. There are probably also some driver boards, but all mixed up in 30 years worth of junk. I just stuck some on Ebay to see how they went. We also have some single element flipdisc modules, which I have never seen before.