Fifth Avenue. A ¾-inch copper bolt in the top of the northwesterly corner of the third granite step or platform at the main entrance to St. Patrick's Cathedral on Fifth Avenue, between East Fiftieth Street and East Fifty-first Street. (Note 5, p. 89.)
This bolt was much easier to find than B. M. 825 just a few yards away. (Rich spotted this one first, too.) It's set in the top step/platform just to the left (north) of the Fifth Avenue entrance to St. Patrick's Cathedral. It was a real thrill to see the carved "B M", still in excellent condition, from the NYBE+A survey a century ago. Hundreds if not thousands of people passed by in the few minutes we spent at the cathedral, but I'd be surprised if any of them noticed this bolt. Hopefully it will remain in good shape for at least the next hundred years.