unused Block Larger Than four 3c Red F grill (94), block of 16 (4x4), remarkably fresh, brilliant full o.g., three stamps are only lightly hinged, most of the others appear to be never hinged, three stamps have some nibbed perfs., otherwise very good-fine block, a very scarce o.g. multiple, Scott retail $6,600.00+ (the never hinged stamps are unpriced) photo