Breakthru: 3M catalog listing 1970 http://www.boardgamegeek.com/image/332323 Breakthru: Can the gold player break thru the silver player's defenses? http://www.boardgamegeek.com/image/287481 Breakthru: Can the gold player break thru the silver players defenses? http://www.boardgamegeek.com/image/287480 Breakthru: Homemade Box -- Same size as Kosmos 2-player boxes http://www.boardgamegeek.com/image/287479 Breakthru: Clean scan of box back (1965) http://www.boardgamegeek.com/image/262226 Breakthru: German 3M edition with alternate cover art http://www.boardgamegeek.com/image/154691 Breakthru: A physics grad student and a computer program trying to out think each other http://www.boardgamegeek.com/image/144966 Breakthru: amazingly '60s cover art... http://www.boardgamegeek.com/image/119969 Breakthru: Handmade Breakthru, with "hollow flagship" option http://www.boardgamegeek.com/image/110101 Breakthru: http://www.boardgamegeek.com/image/103960 Breakthru: http://www.boardgamegeek.com/image/38058 Breakthru: http://www.boardgamegeek.com/image/38056 Breakthru: http://www.boardgamegeek.com/image/10070 Breakthru: http://www.boardgamegeek.com/image/10068 Breakthru: http://www.boardgamegeek.com/image/10066