Welcome to the Forum! Lots of Highway Patrolman (and Model 28) fans to be found here along with a wealth of information. The HP you're looking at is most probably a first year (1954) revolver, and quite desirable. Here's a couple of pics of my 4" HP, s/n S114481 (July-Aug 1954) along with some later Model 28-2s (ca. 1970s). Let us know if you need more info.