1601 Datejust real or fake?

[rolexology]

Hi, I'm trying to get opinion from you guys who have more experience about Rolex watches than myself. A guy online put this this watch up for sale and when I looked up the serial number online that it is made in 1978 while he claimed that it is made in 1970. When I questioned him about this he said what he meant was 70's not 1970.

Then I look at the date wheel the number 6 is different unlike other datejust I see online that is made in 1978. The line in number 6 is all connected on his watch. Also on the bottom of the dial it says swiss only not T SWISS T when I clearly can see there is lume dots on the dial and hands. What do guys think? Is this a genuine rolex datejust 1601? Photos are attached.