Machine description: One (1) Used 1969 Manitowoc 3900B, S/N: 39831, 100 Ton Capacity Vicon Lattice Boom Crawler Crane, Equipped As Shown Below:, - 100LF of #9 Boom, - 20’ 4” Crawlers, - 58,500 Lbs Counterweight, - Mai... more info about the 1969 Manitowoc 3900B VICON.