GunGeek: The answer to your inquiry is:

#1: Smith & Wesson Model 66 with 4" barrel
#2: Doesn't matter.
#3: Doesn't matter.

I was issued one of these for more than 10 years and upon retirement bought it for $60.00 from my department.
Long live the Smith & Wesson Model 66 (and the 686 as well).
Hold into the wind
VarmintGuy