There are other sources that says this movie was made in 1970, and that's believable, because the style and cast is consistent with "The Invincible Eight" that was made in 1970. In any case this is an early Golden Harvest production, and is high quality production.

Golden Harvest was a fledgling company in the early '70s, but they really had fresh new approach to movie making that's evident in this movie as well. First, their actors wore more colorful outfits, second, they worked lot more on character development, third, they had more three dimensional shooting style that featured more close up shots even during the fight scenes. Cinematography was also beautiful in all their early works. They also worked on recruiting fresh new faces that had elegant appearances, and they portrayed them to be that type of characters as well in their stories. 

Now all of this is evident on this film as well, which makes this one of the best movie of the early Hong Kong cinema.

Angela Mao still had the classic old school Chinese hairstyle. She will be playing more contemporary roles with her trademark long pony tail within the next few years. She has a school girlish youthful looks that makes her stand out in any movie she stars in. In this movie, she looks even better as it seems that she's gotten used to acting in her movie roles, and just looks outrageously good. Surprisingly, even though she's over 60 now, she still retains this youthful appearance. Something her Hollywood counterparts never seems to be able to do.

This is a great kung fu film from the early '70s, and is recommended for viewing, if you're an Angela Mao or classic kung fu movie fan.

Mandarin-language cinema across Mainland China, Taiwan, and Singapore explores historical reflection, cultural identity, and personal sacrifice, often expressed through poetic visuals and sweeping narratives. In Mainland China, this takes the form of allegory and large-scale epics that reflect on national history. Taiwan emphasizes intimate modernist realism, generational change, and the search for identity. Singapore contributes stories of migration, multiculturalism, and the negotiation of tradition in a globalized city.

The action genre features fast-paced, thrilling, and intense sequences of physical feats, combat, and excitement. The characters of these stories are involved in daring and often dangerous situations, requiring them to rely on their physical prowess, skills, and quick thinking to overcome challenges and adversaries.

The adventure genre features exciting journeys, quests, or expeditions undertaken by characters who often face challenges, obstacles, and risks in pursuit of a goal. Adventures can take place in a wide range of settings, from exotic and fantastical locations to historical or even everyday environments.

The chief of the Black Tiger School, Hung Wei joins the rival Dragon Fort school as a blood brother with some evil intentions.

Angela Mao and James Tien in Thunderbolt (1973)

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Jackie Chan and Dean Shek in Dance of Death (1976)

Angela Mao and Tao-Liang Tan in Jue bi tai yang ta (1977)

Thunderbolt

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