lucky ring

Hello, I just got a lucky Ring from a serpent, I just wandering, what is the drop chance of that? If anybody know, please let me known

I panned on a lucky day, got the lucky ring and noted the location/the times of the panning spot i got it from (7:50am left side of the standard farm lower pond). Before the day ended I quit the game because I had things to do and wanted to reload the day later and get the lucky ring. Normally...