whats the lightest combined weight in a world title bout?

[USA LOVES THE KLITSCHKOS]

recently we had the heaviest combined weight in a valuev bout, but what was the lightest combined weight in a world title fight? it must be somewhere around the 13 stone mark

I know this is about the lightest.That Was the heaviest until Butterbean weighs in at 417.5!
Esch, Siciliano combine for 731 lbs...

http://www.fightnews.com/