More to explore:
Godzilla vs Gigan 8x10 11x17 16x20 24x36 27x40 Vintage Movie Poster Fukuda A | eBay
Godzilla Kontra Gigan Advertising Vintage Poster - Canvas Print Artwork
Godzilla Kontra Gigan (Czech film poster?)
These Rarely-Seen Godzilla Posters Show You A New Face Of The Monster | Polish poster for Godzilla vs. Gigan, 1977
GODZILLA VS. GIGAN (1972)
Godzilla (Poland, 1957) - classic Japanese monster movie posters from Poland
Son of Godzilla (Poland, 1974) for Kaiju films
Godzilla vs. the Smog Monster Czech & Polish posters for kaiju films
Godzilla vs. Gigan (Toho, 1977) Polish Posters for Godzilla and Others
ghidrah the 3 headed monster by *strongstuff on deviantART
Godzilla vs. Gigan (1972)
Suntory Whisky, Japan, 1968.
Brandon Schaefer's retrofied posters for modern movies.
Godzilla vs the Bionic Monster (a/k/a Terror of Mechagodzilla a/k/a Godzilla vs. the Cosmic Monster), 1974
In the Mood for Love Japanese movie poster
Finally, an illustration for the Monster Kid's epic stories about Mommy Godzilla and Baby Godzilla. He is dictating an entire series of epic adventures for them.