I may have the dates wrong, but I believe Tilly did S. Ho! about two years before Winged Foot. It is a private club occupying a relatively flat and small parcel of land. It's pretty indicative of a Tillinghast course (without natural elevation change) - push up greens, heavy greenside bunkering, shot variety, etc.
It has recently undergone some renovation work, as completed by Joel Weiman of McDonald & Sons, Inc. The green complexes have been reworked after a botched renovation job back in the 60s or 70s. The fairway bunkers may or may not be new, I'm not quite sure. They are undergoing a master plan renovation project that will eventually include work on the tees, driving range, and reinstituting some classic Tilly design features (ie the "Great Hazard")
Overall, its a good course from a good architect, but after playing S. Ho! you'll realize why you've never heard of it: it's not in the same league as other nearby Tilly designs and thereby overlooked and overshadowed.