May I ask the first three numbers of the serial no. as I am trying to accurately date to the specific qtr.mine which looks the same, (I do not have the tools to open the case back). Would you believe the my local watch shop advertising servicing of Rolex gave me an insurance valuation with a date of manufacture of 1980. And my one is a PGC , I think they mixed up my 621k serial number with a 6.21m serial number!!.
PS I think the newer insert looks better.