That appears to be an early 66-0 with stainless sights - a rare and fairly collectible version.
Yes it is a 66 no dash 4k54xxx with the correct sights,TT and TH. I think it is a 1973. it is not perfect but it is nice.
I have wanted a revolver for a while and I found this one at a local gunshow a couple of weeks ago.
Almost bought a M28 the day before but by the time I decided, it was gone. I went back the next day and this one had shown up.
As much as I hate to admit it, I have yet to put a round through it. Between work and the weather....