Went to an estate sale the other day and saw a Starrett combination square. The same one we're selling a Woodcraft for about $75. I told the seller "That's a really nice square - what do you want for it?" When he said "A dollar" my wallet came out so fast it almost caught fire :-).
It is, like most old squares, missing the scribe, but there's no rust and it tested at absolutely square.
Between it and my old Goodell-Pratt, I've got a lifetime supply of combination squares :-).