It should have 65 HP when you get the second 70, which puts it at 52.
I've sold about 6 accounts with those exact stats. Here's the most recent... http://img522.imageshack.us/img522/4299/35179625.png. It has 66 HP because I did 1-55 Magic using combat spells, but most of the magic EXP was obtained with alching. It was just barely 53 combat.