My grandparents listen to traditional javanese music lol, because they live in Indonesia, and there was barely any access to the internet. My dad is the one that introduces me to these kinds of songs, those were the times where cassette tapes were introduced and are spread around the world.
I love the guitar sounds, but of course, back then, the sound quality of songs were not as good as today. The songs have a lot more reverb and sound more muffled (if you listened to actual 1950's to 1960's music, you'll know what I'm talking about). If you want to bring a more 50's atmosphere, maybe you can add more reverb to the instruments to bring a more 1950's ambience. Then again, the song still sounds good if you don't wanna tweak it, great job with this one.