You can get alot of info on bottles here too....Jim http://www.google.com/imgres?imgurl=http://www.antiquemedicines.com/bottletypes/graphite.JPG&imgrefurl=http://www.antiquemedicines.com/bottletypes/bottletypes.htm&usg=__EKm-m2yQZOLHzISP0UpBib-JMJM=&h=240&w=320&sz=31&hl=en&start=11&um=1&itbs=1&tbnid=iSbyQM_YaMjddM:&tbnh=89&tbnw=118&prev=/images%3Fq%3Diron%2Bpontil%26um%3D1%26hl%3Den%26safe%3Doff%26sa%3DN%26rls%3Dcom.microsoft:en-us:IE-SearchBox%26rlz%3D1I7ADSA_en%26tbs%3Disch:1
Well I guess I need to think about the information link you gave us Jim (epackage). When I got into this link I ended up on Google "Iron Pontil" and found more pages than I can comprehend on some interesting empontilled bottles to the statue of David. Google seems to have picked up a skidilion of reference items. I will have to go back there to see if I can gain any thing from the coverage.
As for your bottle 'preditor', I didn't see a picture of the bottom of your bottle, yet you decided it may not have been pontiled. There are blowpipe or tube pontils, puntee rod pontil removal marks - and these can vary because of the contact material and also the bonding agent past. I have read a lot on this subject, but writing detailed descriptions of how it was all done - didn't happen to be well covered.
As Red M said, it is confusing at first, but once you have a pontil, you will know it. Don't worry about the iron pontil stuff on this bottle. It would help if you could show a picture of the base. I'm going to guess it's not pontiled, but you never know. Is the bottom smooth, or is there an indented jagged spot?