[NPD64]

I have a two tone submariner that I purchased from a friend. When I took the band off to record the serial number I found that it began with the letter
"E" followed by a 4 digit number.
My only concern is that the four digit number. Should it be a larger number or would that have been that production number when it was issued.

I guess what I am trying to say is the four digit number ok or is the watch possibly a fake?

Thanks
Richie