I think I did it. I can work it out so it is 4 lbs. It seems there is no First Class International Mail option for 4lbs, 1 ounce. But there is for just 4 lbs.

$15.95 on chart below. (last item on the chart) (I can't use the small flat rate box because it is too small.)

Robert

(Love this easy picture upload thing, David. )