If it works well I wouldn't hestitate at that price. I bought a Record No. 8 in good working order for $80. It needs a good clean up, straightening of the handle and paint (Valspar has a good match). Mine needed new jaws and I picked them up at Acklands-Grainger for about $35.
I have 5 Record bench vices and a couple of wood vices. My No. 8 is the second one from the right. That's a No. 1 at the far left.
I bought a No. 6 and paid $80 for it too. It was in similar condition to my No. 8 and it cleaned up well.
Records are GREAT vices and you would be happy with that one for $100.