Trying to identify a Rolex left to me to me by my grandfather

[stuartpanda]

Hi there. Looking for help. I inherited a watch collection from my grandfather which contained a vintage Rolex. It is still in original box with recipe from seller dated 29th September 1972. It’s a precision with maybe not the original straps. I don’t know how to tell if it’s still original. He worked in the merchant navy after ww2 and used everything he bought. It looks in good condition as does the box and leaflet from the Rolex agent. It has serial number and model number. Not looking to sell just gather info on what I have. Thanks for reading and any help given.