ID Shooting:
1)Yes, I'll post some new pictures of my Speed Six, with the two different wood grips that I have for it(Mustang and Herrett's)after I have installed them(Soon!)?
Serpico:
1)The only difference between an Speed-six and your Police Service Six(Also called just a Service Six)is that the Speed Six has a round butt grip frame and your Service Six has the same square butt grip frame as a Security Six! They both have the same fixed sights(But, the Security Six has the adjustable sights)! Mechanically all three of these "Six series" revolvers are identical!
2)Your Speed Six also has a heavier barrel than on the standard barrel on my Speed Six! If you look close, you can see that your barrel is heavier and with a wider sight rib and a wider ejector rod shroud! Sometime near the end of the production of the "Six series" revolvers, Ruger had quietly made the standard, 2-3/4" barrel heavier(Just as I have described)on the Security/Service/Speed sixes!)! There were some of a few Model GS33 speed Sixes(Made originally for the U.S. Postal Service-and, with some overrun guns!)that had a three-inch, heavy barrel! I also have a Speed Six like yours, with the heavier 2-3/4" barrel!
3)Take a look at the barrel ejector rod shroud on my Speed Six and notice that the front of my shroud, is almost straight up and down-where your shroud is slightly sloped towards the front! And, if you look real close and compare both of our barrels, you will see that your barrel is heavier and thicker and the sight rib on your barrel doesn't appear to rise as much above the top of your barrel as mine does(This is due to the larger diameter barrel!)! Also, look more closely where the barrels join the frame-and, you will see that at that point there is not nearly as much frame overhanging the sides of your barrel-but, mine shows much more frame overhang all the way around the barrel! If you could see both of our barrels side by side, you would immediately see how much wider that your barrel sight rib and your ejector rod shroud is than on mine?