This is a cast aluminum BBMB mast bearing made by Delhi that looks to be what is currently offered by Wade (Delhi).   Made in Canada and turns effortlessly.  It was one of two bearings atop my tower.  A grease fitting was carefully installed and subsequently the bearing received regular greasing intervals every year when I climbed tower for inspection. Will accept up to 2.125″ mast diameter.  It turns effortlessly and should offer many more years of service.  Call Dan for any questions.

All reasonable offers considered.