Hi,
Yes indeed, it is a 27-2 and I'm glad you mentioned this fact. They are fine revolvers!
You mentioned the "3-T"s, but LUCKILY for you (IMHO), it does not have the Target trigger! Instead, it has the narrower "combat" trigger that was intentionally put on the earlier 27-2 revolvers!
Why? Well S&W correctly reasoned back then that a 3 1/2" barreled N frame revolver is a fighting revolver . . . and thus will be used for fast, double action work, so they put the narrow trigger on the 3 1/2" versions.
This changed in the mid-1970s when S&W started also putting the target trigger and target hammer on the 3 1/2" barrel ones too . . . a marketing move that had no sense from a shooter's standpoint!.
At the same point in time they also ditched the original service stocks ("Magnas") for the bulky, fat-tazz "Target" stocks like came on the longer barreled 27-2 versions.
IMHO, you ended up with a target revolver in every other way BUT with a chopped off target barrel. Looked/looks incredibly stupid IMHO . . . sort of like putting tires and wheels from a semi-truck on a sports car!
Others on the forums are sometimes not as "diplomatic" as I too!
So . . . you got "lucky" . . . you got an earlier 27-2 3 1/2" version with the narrow trigger that allows better, faster and more accurate double action shooting (for defense AND for matches).
Now . . . please consider putting those "original grips" back on your 27-2 and you'll have a classic that folks "in the know" will drool over. Or . . . save the original stocks to increase its value if/when you ever sell it. But . . . the revolver will be worth more with the magnas on it and they are a wonderful grip profile too!
BTW, on the inside of your unshown, original magna stocks should be the serial number of your 27-2 recorded. Back then, S&W fit the magnas to the gun!
Here's my own 27-2, from 1970 in its original bright nickel plated finish and with its original magnas . . . a gorgeous gun in every way and, IMHO, THE perfect Model 27 . . . best looking, best balanced and most desirable barrel length ever offered in a Model 27-2 (though others would argue for the 5" version)
Again . . . you've got a nice 27-2!