JoeBW and I were working on a Gerber variation spreadsheet a couple of months ago. There are a surprising number of evolutionary steps along the way. Supratentorial, the needlenose model you have labeled #3 is actually version number five on our list. It came in either the needlenose (like you have pictured) or a new beefier, blunt-nose jaw version. (shown below)There were a number of other subtle changes as well.
I'll post it....if I can figure out how!
The Gerber spreadsheet hasn't made it onto the web yet. It was sort of a "work in progress" as we identified additional versions. I'm thinking its pretty well complete though, so I'll post it....if I can figure out how!
Ouch!
OT: where can I get a good (and cheap) GIF editor?