They came after the gold no crown guard 1675 which shared the same style dial with the dash. With Rolex we never say never, I was not in the factory in 1968/9 nor am I the original owner, but my experience is that the dash is without a doubt correct while no dash could be correct but could be a later replacement so choose the story line you want to follow. I will say this is the case for a 1675 no crown guard no dash and it will need to have a story to explain.