The Mummy OS that sold for $453K back in 1997 was from the collection of Todd Feiertag, and I dont think his copy was heavily damaged and restored. (I'll email him and ask, for verification). At the time it was auctioned, 2 copies were known to exist, so maybe it was the other copy that needed a lot of restoration. (I seem to remember reading one was found sandwiched under some other posters on an exterior barn wall or something similar, and was heavily damaged due to exposure, moisture etc).
Here's an article from
The Deseret News, dated March 2, 1997, after the Sotheby's auction was over, giving more details:
http://www.deseretnews.com/article/546423/MUMMY-POSTER-COSTS-A-TREASURE.htmlAnd the wikipedia image is
not the S2 version. The 1932 US OS is shown.