1) PAnerai Model = PAM
2) Officine Panerai - Corporate name
3) I'll list what I know:
FGD - RWG member who prduces quality dials for older PAMs
LH - Little Hero , also a rep fora modder known for his very high quality PAM components and reps!
EL - Eddie Lee , don't know a lot about him!
JF - Jimmy Fu, a renowned risti who had some PAM casesets manufactured to a very high standard, his cases are very sough-after among rep fora members!