To the OP: WOW! Nice find. My first centerfire was a Model 28 Highway Patrolman 6". I still remember the day I bought it. It was at a Big-5 sporting goods store in Orange County, CA, back in the day when they sold handguns. As soon as I saw it, I knew I had to have it. One of those guns that nagged at me for days, and I ended up shifting funds from here to there to be able to pay for it.
I went back a few days later only to find a burly biker looking at it at the counter. He said he'd come back on payday. So, after he left I asked to see the gun and purchased it immediately. It was going to become a big brother to my Model-18 .22 LR.
In those days (1980 something) the 28 was marketed as a weapon for the sheriff or highway patrolman on a budget and sported a duller blue finish than the Model-27. These days, that austere finish on the Model-28 looks like deep blue beauty compared to newer blued gun.
The sight of an old well preserved 28 strikes a chord with me. It was also the gun that got me interested in reloading. Thanks for posting it. You have a real winner there.