(Unconfirmed details marked with an asterisk.)

Godzilla

-Original negative missing or destroyed. 

-A fourth generation fine grain print exists and is the basis for all home video editions.

-Two third generation dupe negatives exist and were the basis for the relatively recent 4K restoration.

Godzilla Raids Again

-Original negative missing or destroyed. 

-Fine grain print exists.

-Foreign element used for German and US versions. Has one alternate composite effect in reel 6 of the film (a shot of some optical snow around Kobayashi's plane). Missing or destroyed.

The Mysterians

-Foreign dupe negative - the basis for the US version and several world versions derived from it. Many of the optical effects contain one or two additional frames at the beginning, not seen in the Japanese version, and an equal number of dropped frames (sometimes a combination of dropped and additional frames) at the end of the cut, somewhere in the middle and/or at the beginning of the next shot (to prevent the sync from getting ruined I guess). The foreground plates on many of these effects aren't opaque like in the Japanese version. Later conformed to the Champion Matsuri cut in the 70s. 

King Kong vs. Godzilla

-Negative conformed to Champion Matsuri cut.

-Conformed negative appears to feature some alternate splice marks. May be missing or destroyed.

-16mm positive element used for creating rental prints existed until the 80s.

-Trimmed portions of the 35mm negative resurfaced in the early 90s.

-No complete, 35mm element for the Japanese version known to exist, but the original mono and 4.0 stereo mixes still survive intact. No photochemical restoration working from the trims and existing Champion elements has been performed, which would allow for the first (basically) complete 35mm, high quality master since the '60s.

Mothra vs. Godzilla

- Negative conformed to either the Champion Matsuri cut or 1980 reissue.

- Internegative element used for all domestic and foreign releases of the Japanese version since. The tail end of reel 5 seems to be cut short by a second on this source, or at least most transfers struck from it.

Godzilla vs The Thing

-Textless backgrounds part of the transfer from a??? to UPA.

Frankenstein Conquers the World

-Textless backgrounds part of the transfer from Orion to UPA in 1985. Utilized in UPA's TV version created in the '80s or '90s.

Invasion of (the) Astro-Monster(s)

-Negative conformed to Champion Matsuri cut. 

-Foreign internegative (which is uncut obviously) resurfaced back in the 80s.

Son of Godzilla

-Original camera negative (or an interpositive) has been damaged in places. In most current available versions of the film, damaged frames have been photochemically patched with duplicates of previous ones, creating a "stutter" effect.

-Stutter free foreign element used for US, Italian, and French versions.

Godzilla 2000

- Master domestic element. Edits have noticeable globby glue marks (e.g. the shot of Katagiri at the end of reel 3). The Toho R2, the Universe R3, and the HDTV version are mastered from this element. Color timing on R3 and HDTV is extremely murky, the entire image taking on a sickly, dark green palette. R2 leans towards a more neutral colorscape.

- Master foreign element. Edits have the familiar jagged splices. The U.S. Mike Schlesinger cut uses this element, as does a fullscreen Korean DVD (cue marks are visible on this edition since a theatrical element seems to have been used).