I also found a benchmark on the Indain Pass trail South West of Heart Lake in the Adirondacks at
N4891160 E580120 or N44°10.1' W73°59.9' The BM is shown on USGS Keene Valley topo at 658.5 meters.
I deciphered AMD 13 on the center of the disc embedded in the rock surface. However there is no recognition when I search to log this find