Revolutionary War British Brass Large Gang Mold

Revolutionary War British Brass Gang Mold Large ex. Robert Oswald Collection with his tag.  Originally from NY.  These large molds were used in forts.  Mold for large musket ball and many buckshot.  Weighs several pounds, but unsure of exact weight.  15 in long closed and 30 in long open. .  Very rare to find these anymore and only selling to pay for recent acquisition. Truly impressive mold.