Poster for Loyal Kanto Brothers (関東義兄弟), 1970, directed by Seiichiro Uchikawa (内川清一郎) and starring, from L to R:
Hideo Murota (村田英雄)
Saburo Kitajima (北島三郎)
Meiko Kaji (梶芽衣子)
And a better look at Meiko on it.
I scanned this from a Nikkatsu promo book that had similar horizontal posters for movies being released in 1970 called ‘70 Nikkatsu New Year’s Movie (‘70 日活のお正月映画).