Need help on the authenticity of this Rolex 1601

[catking]

I have been looking to get my first rolex and chanced upon a datejust ref 1601, serial number starting with 6572XXX.

It has a rose gold fluted bezel with champagne dial and what caught my attention was the year :1980. From what i recall, this was the year that datejust reference number became 5 digit. Additionally, the dial labelled as "SWISS" for a tritium dial.

Is this watch authentic and original?

Thanks for the help!