The stencil pictured is the one that Inline Tube is selling. It's not really correct at all. There were 2 sizes of USS logo (early and late), font inaccuracies (as John stated), missing "trademark" under the USS logo, etc.
As Charles stated, the steel sheet was stamped as it rolled down the production line. Therefore, the stamp may be anywhere on the tank, if on it at all. I've seen the stamp on different locations of the tank bottom and on tank tops.
This should be researched a little more before it's marketed as "correct" by the seller, IMO.