Re: PIH Production Vader Helmet Up for Auction
ANH: A New Hope
Don Post Studios: California, USA, made tour suits at the time of the Star Wars release
DPS: Don Post Studios
"EFX guy": special effects professional (I assume)
AA: Andrew Ainsworth, made the original stormtrooper costumes (vaccuformed them) in 1976 for Star Wars, owner of Shepperton Design Studios in the UK
WTF: well I won't define that hehe
Jeff W./GH line: helmets received from a Don Post employee in the mid 90s, essentially offshoots of whatever template Don Post might have worked on for the tour or toy helmets. Also referred to as GH/Jeff
ROTS: Revenge of the Sith
Rick Baker mold: a mold taken off the original ANH Vader helmet back in 1977 and used to make a number of promotional (and screen) helmets over the years, as well as the recent eFX licensed ANH Vader helmet. Rick Baker was second unit makeup artist for Star Wars.
DJ: Darth Jones, former ILM employee
SL: SithLord.....me
DJ and SL in that context refer to helmets coming from the Rick Baker mold.
Fyberdyne: Someone in the early 90s that made helmets from a template that supposedly came from Don Post studios. They are distinguished, among other things, by a latch on the forehead for securing the helmet. It also may be an earlier version of the GH/Jeff helmets, or related through a similar source.
Baker ILM: same as the Rick Baker mold. I call it Baker ILM because it was originally referred to as simply the ILM mold.
PIH: Profiles in History
DP ANH: hypothetical Don Post studios Vader helmet of the A New Hope (Star Wars) style.
Paul Allen ESB: An original stunt Vader helmet from the Empire Strikes Back sold in auction to the former Microsoft VP Paul Allen. Presently touring as part of the Seattle Science Museum.
ESB: The Empire Strikes Back
ROTJ: Return of the Jedi
SW: Star Wars
The Prop Den: A definitive forum for discussion of Darth Vader-related topics and other Star Wars topics. Also called "the Den".
eFX: licensed producer of Star Wars helmets.
I hope this helps, welcome to the RPF!