Isao Tomita died recently, and I was listening to his music and really fell in love with the first synth that plays in this song here.

https://www.youtube.com/watch?v=rlCzO0GX_bA

It's very very simple, analog, and I'm sure it has vibrato, a simple wave type, etc. I just can't for the life of me figure this one out. Any tips or suggestions?

(RIP Isao)