Authentic 1972 Oyster Perpetual?

[bauhaus88]

I came across a 1973 Oyster Perpetual Rolex for a little under $2,000. I had some questions regarding what a good price would be for a watch this old and with some heavy bracelet stretching.

My friend said he thought the band was a fake, but the seller believed it authentic, I had a hard time deciding. This will be my first Rolex so I appreciate your help.