That's a nasty one, considering the segments for a "1" are also used in 7, 8, 0 etc, so it disproves any theories about missing bits, wiring etc etc....
Marty, different on these Gottlieb dispays, segment 'h' is only used for 1. Not used in any other number
just about to tackle it now.
What you are saying makes 100% sense, forgot that the "1" is separate to the rest of the other segments.