The Plaisted Polar Expedition Speedmaster
"Apparently, insurance salesman and amateur adventurer Ralph Plaisted and a few friends decided on a lark to see if they could get to the North Pole on snowmobiles, the first land attempt. They had one failed try then succeeded in 1968 after a 43 day effort. They (Plaisted and 3 friends) used Ski-Doo snowmobiles, 300cc with 16hp, amazing in today's world of 150hp sleds! The used Omega Speedmasters that not surprisingly, performed quite well (44 days at an average -52°C)."