The first 3M edition has number of differences from the later edition(s). First, it has a different insert to accommodate some differently shaped game components. Second, it has plastic boat movers with metal inserts in the base instead of the 100% metal boats found in the later editions. Third, it has four metal cylinder course markers with red plastic flags instead of the later standard three red metal bouys and a white boat. Finally, the islands are constructed from a different material (plaster?) than the later molded plastic.