Dear Mace,
Thank you very much for posting the screen cap regarding the Snake Eyes. Unfortunately, I am having trouble seeing the close up of the screen cap you posted in order to make an accurate judgment of the item in question.
Here is what I do see: I see the color as being darker on the bands and the cel on a very dark background, but the screencap is very fuzzy and too small to properly examine. When I was looking at the other Snake Eyes cel (the one in question), it definitely shows very evident age wear for a 25 year old cel (especially the line fading), which is why it looks like an original to me. I have never seen reproduction cels that have line fading as this cel does. That is why I cannot conclude this as being a repro/fake cel. But, here are other questions I have.
Is the screencap from a digitally remastered DVD or the original 1980's release from a video?? The reason I ask is in many cases, when a series/film gets digitally remastered and released onto media such as DVD, the colors have sometimes appear different. I have seen this a lot in Disney films.
The other thing I am wondering is if this is indeed the exact screen cap of the specific cel of Snake Eyes?? I have never collected GI Joe before, so not familiar with their production techniques. But, I have collected from Disney production artwork and it is a common practice for the Disney studios to "reuse" scenes and drawings for their film shorts in order to save time and expenses.
The other thing I am wondering is if it could be lighting effects when they initially snapped the cel or use of correction layer for the color. So, the possibilities are definitely there.
In reference to the term "G1", I am very sorry, but I still have to disagree with you regarding the term G1 (this is why I mention it as a gray area). Below are a few of the points:
The quote you gave: "The series was originally simply called The Transformers until the relaunch in 1993 was titled Transformers: Generation 2, after which fans applied the name Generation 1 (later made official by Hasbro) as a method of separating the different Transformers eras."
The term G1 did not come into effect until 1993 which was after all the releases of the US and Japanese lines in question. And Hasbro made it officially "G1", but does not necessarily exclude Japanese Takara either.
If you read further on in the Wikipedia link that you posted, you can also see what toy lines were included as "Generation One". Here is what they say:
"1988
Transformers continued on despite smaller support and still managed to introduce a plethora of new characters. New Headmaster and Targetmaster characters were introduced, but the new driving forces for the line were the Pretenders and Powermasters (which featured the return of Optimus Prime)."
All of these toys came out after the Takara release of the same toys. The cartoons Headmasters and Masterforce featured these characters and toyline. And as you mentioned, the term "G1" was not coined until 1990's when Hasbro re-released the line calling them Generation Two.
But, you also know that Takara has the original rights to Transformers and Hasbro only had the permission to distribute them in America and due to licensing issues had to change the name from Ginrai to Powermaster Optimus Prime in the toy-line.
So, with that said G1 Powermaster Prime for the US release is the same toy featured on Masterforce Ginrai/Godginrai. I have heard both arguments between the term G1 in reference to only being used as a US term, but, also included the original Japanese markets (hence the gray area). Since the G1 was appointed for the toys up to 1991, and the Japanese continued releasing their series throughout those times promoting the exact toys that were also released in the US, I do think it is quite reasonable, and very common for collectors to refer to both lines (Japanese and American toy versions) as being "G1".
So, referring to the Headmasters/Masterforce/Victory as being part of the G1 era, I still feel is within reason. But, it is okay to disagree with this. Many Japanese toy collectors will argue this because Takara is the original owner of Transformers and hence are the real #1. So, the collector's arguments are why refer to Powermaster Prime as the G1 while the exact toy in Japan that was released by Takara before the Powermaster Prime was released in US later?
Also, here is some more reference from Wikipedia regarding the "Generation One TV animated series:
http://en.wikipedia.org/wiki/List_of_Transformers_TV_series
Here, you can also see they refer to the Japanese series as being listed as part of "Generation One".
But, again, thank you very much for providing us the screen caps and the information to the Wikipedia site. Now we are able to make judgments based on our own accord.