pdxfrogdog
Adventurer
I am fairly certain it is a 50 amp Anderson connector.
http://www.powerwerx.com/anderson-powerpoles/powerpole-sets/sb50-sb-series-50-amp.html
I just packed mine up for the Land Rover National Rally, but I double check in the morning if need be.
Brandon
Yes, you have it right... SB50 Anderson.