This is a polka by Matej Kovačič, from “S Polko In Valčkom Po Sloveniji” released by Ansambel Borisa Kovačiča in 1986.

Preview:

Learn to play includes:
📝 Sheet music pdf (F)
🎼 Accompaniment/playback mp3 (F)
📹 Slow tutorial video (F)
🎹 Play-along video (F)

Original recording
My accordion arrangement