Some of Herbrands early patterns are kinda weird. That is one of them, it isn't quite an S, more of a bent zig zag,
I can spot them in a box full of junk from 20 paces ;P
Hardly ever run across them tho
Dunno how old it is, it doesn't have a V'd jaw, but I don't think any of Herbrands ever did...
Very nice :)