The TV series that was broadcast just a little before that was also pretty remarkable [1], it involved Miyazaki, Isao Takahata (who later made "Grave of the Fireflies") and Masaaki Osumi, who was in charge of the first few episodes which have a really special jazzy and cool feeling, which I've only seen reproduced at the same level in "Cowboy Bebop" which was made more than 20 years later.
Also, the opening scene of the even later Lupin the 3rd TV series dubbed in Italian will forever be one of my best childhood memories. I don't know how they managed to do it but sometimes the Italians were able to create opening scenes that were even better than the original ones in Japanese, a very hard feat to accomplish as the latter were also very good.
The music participates a lot to the jazzy feeling. Both for Lupin and Cowboy Bebop, by the way.
Interesting trivia: the current voice actor for Lupin in the anime in Japan is an impersonator comedian who was known for his impression of the original voice actor, and took his place after he passed.
Also, the opening scene of the even later Lupin the 3rd TV series dubbed in Italian will forever be one of my best childhood memories. I don't know how they managed to do it but sometimes the Italians were able to create opening scenes that were even better than the original ones in Japanese, a very hard feat to accomplish as the latter were also very good.
[1] https://www.animenewsnetwork.com/encyclopedia/anime.php?id=8...
[2] https://www.imdb.com/title/tt0095327/
[3] https://www.youtube.com/watch?v=AKmzwpALHg4