Hi there was another post here from 2013 thought I would try a new one.

I purchased a Triumph bike and have been unable to find the year it was made. It has the Sturmey-Archer logo on the back wheel but in pictures the year is below the ASC I did find a stamped 72 to the right but I believe this bike to be somewhere closer to the 50's. The frame stem off the seat has 1039076. Can someone help me date this bike?