For auction is a large, vintage, unused, NOS, bronze, double sailboat block/pulley. There is no play in the sheaves, or any evidence of it being used. The sheaves can be lubricated by the oil holes in each side. The sheaves measure 5/8" wide and 1-15/16" at the middle diameter. The cotter pinned eye is 1" ID.  Overall dimensions are 7.5" length, width is 2.75", and height is 2.5". There are oil holes in the sides for the shaft. This is a heavy duty, high quality block. The dark patina speaks to it's age.  I don't see any maker's mark on it, but it looks like a Nathaniel Herreshoff "clam shell" design. This would be excellent for any classic sailboat project. Good luck.