Thanks to the fine folks at the 007 Dossier, we finally have some evidence as to how Thunderball appears from vintage IB material.
http://the007dossier.com/007dossier/post/2017/02/09/Thunderball-16mm-IB-Technicolor-print

Despite it being a 16mm segment, the saturation levels are unlike anything we’ve seen or had access to. I ran it against every copy I have and came up with this:

The closest in overall look is the 1989 laserdisc but is a tad too heavy in the reds particularly in skin tones. The 1995 master/SE DVD fixes this but is less saturated. The UE is completely washed out in color and far too bright. The BD is remarkably similar to the print sample, but it appears this was either the source scan for Lowry or a new one done where the team then tried to replicate the color via digital means. Thus it comes very close to the source but things such as Fiona’s dress are far too teal when they should be less so.

Also, the day for night shooting is noticeably off in the sample and all the video transfers have it pretty much intact. I think the original video source for 1989/1995 was a IP or protection element made sometime after the 60’s and thus it is in very good shape but lacks the Technicolor bold printing-just like the rest of the Bonds do. The only ones that seem as if they may be Tech are the Criterions and the first letterboxed MGM Dr. No (as it shares the same print source as the Criterion. I have not yet seen all the earlier pan and scan copies, but seeing as TLD’s pan n scan has vibrant color that looks like the BD palette some could be interesting.