Update - someone pointed out to me that Emovie has updated the record of the original auction with this information:
"Finally, note than an American Godzilla expert tells us that this poster is a 2005 reprint from a Japanese box set because this art style was only printed in the B1 size for theaters. However, an advanced Japanese collector tells us that it is a theatrical poster from the first release which he personally saw displayed in theaters when the film was released. Clearly this is conflicting information, and we will update it if we learn more from anyone else."
(you can see the archived listing here:
http://www.emovieposter.com/agallery/archiveitem/2815352.html)
now, of course last time they noted me as "the world's leading Godzilla expert" when using my information in a correction (
http://www.emovieposter.com/agallery/archiveitem/15268918.html), but now I am just downgraded to an "American" Godzilla expert (I guess the Japanese experts are all better?).
At any rate, here is the full story of why that particular poster is not/was not available as a B2, and every other Ohrai poster in the Heisei era was.
When Godzilla 1984 came out they released Ohrai's beautiful poster artwork as a B1 poster that was available through the Godzilla Fan Club and select theaters.
When the next Godzilla film was in production (Godzilla vs. Biollante), The Godzilla Resurrection Society (at the time the biggest Godzilla fan club in Japan and one that collected 40,000 signatures to encourage Toho to even make Godzilla 1984) complained in their fanzine that Ohrai's poster art wasn't made in the B2 size - which is the most collected size in Japan. Toho actually listened and made sure that Ohrai's artwork for Biollante was produced in B2 and B1 sizes (Emovie has sold the B2 before -
http://www.emovieposter.com/agallery/archiveitem/10732346.html).
Godzilla vs. King Ghidorah was the next film to be made in the series and Toho skipped using Ohrai's art for the advance B2, and only used it for the B1 poster, instead producing a photo-style advance B2 poster (Emovie has sold this advance before -
http://www.emovieposter.com/agallery/archiveitem/2858800.html).
They did use Ohrai's art for a special B2 poster that was sold at the theaters (Emovie has also sold this -
http://www.emovieposter.com/agallery/archiveitem/5578902.html).
Toho got tons of complaints that the artwork wasn't used for the B2 poster also. So when they showed up the next month at January's Wonderfest in 1992 (kind of the Japanese equivalent of ComicCon), they had a special B2 poster using Ohrai's artwork printed up and inserted into the new Edition of the Encyclopedia of Godzilla. Even though they issued one of the Encyclopedias for every film, this was the only one to include a poster (and it was folded of course to fit in the book) and there was a big cover blurb announcing the poster - see the green circle I put around it on the attached photo.
Toho apologized and told everyone at the show that all of Ohrai's artwork in the future would also be used for the B2 format posters (and it was). I only know this of course because I was there. Unfortunately there weren't any cellphones so I didn't get a recording of the Toho rep saying this, and he didn't send any emails out about it. But it has been common knowledge for many years among Godzilla fans, and even in my 1998 book I show the two different advance posters and note the Ohrai art was not available in B2 size (see photo).
Did Emovie's "advanced Japanese collector" see a poster with this artwork at the theater? Quite possibly. Most likely it was a B1 poster. It could have been the special B2 poster they produced and sold at the theater (in Japan almost every theater has a souvenir stand selling posters, programs and other movie tie-ins), it might have even been a folded B2 from the encyclopedia being used by the theater.
But it WASN'T a rolled theatrical B2 - because they didn't make any.
Emovie does great work on keeping an archive, it's very useful and it only takes a little bit of effort to get the information right.
I've done the research, use it.