Maybe one to two hundred. Really hard to say, but I don't think more than 100 war time #2's exist today and probably less than that. This is both chain link and drilled thong combined. I don't think there are more than 50 in collections and that may be a generous number.

Read here about one of the first two made:

http://www.rmkcollector.com/knives-collector-interest/bo-s-first-stiletto