cover 1888-91 Official 6d. violet and 6d. carmine (2) printed registered envelopes (each 228x100 mm.), being Public School Savings Bank Returns to Sydney, the first from Sydney showing "OFFICIALLY REGISTERED/SYDNEY/3D TO PAY" oval d.s., the other two (on different stock) from Grafton; the first with a few minor faults, otherwise fine and a scarce group.