i have two
space hawks 250 made
and gtb rock encore 250 made, but i have the full machine, not just the upgrade for the the original rock game,
so i believe there was less than 100 of them?, not sure, it seems to be the gtb rock upgrade to rock machine is more common. it was a translight upgrade and sound board upgrade from what i have read,  where as my machine was rock encore from the factory with cabinet and all. sort of cool i guess. but i wish my machine was an upgrade as the original rock cab art was nicer imo

i love my space hawks game im going to keep that in my lineup,