As I stated in a recent thread, in my database of the .22/32 HFT's although the order came down in May of 1922, the first gun to show up in my database was shipped 10/9/1923.
Is it possible that a gun from 1930 doesn't have that roll stamp, absolutely. If the roll stamp broke one day, S&W continued to make guns, they would not stop production and send everyone home. It is also possible that the gun stayed in the factory either as a personal gun of an executive, a salesman's sample, a gun that was sent out to a magazine writer and returned at a later date, from the factory collection or one for some other reason that I can't think of right now.
One must also remember that shipping dates and production/manufacture dates are not one and the same. We have seen examples of two consecutive serial numbered guns shipping as much as 10 years apart.
Back to your gun, we would need more information. Where did you get the 1930 date from? What gun is it? Do you have a serial number?