no dash -1
The 52 no dash pistol had the ability to switch from single action to double action trigger. I Tried it once on mine, and never cared to switch it back to double again. Also the 52-1 was single action only and they also included a dimple at the bottom of the frame for a target weight they introduced.
The only thing I don't like is that the required fitting to the frame, and I had seen a few pistols, I purchased with a weight on it, once removed it had damaged the finish on the frame because it was forced on.
I love shooting with the weight, and there are a few different variety's out there, but not as common as the S&W weight.
I have a PDF Article on the model 52 by Gil Hebbard, if your interested, he stated that the 52 had more of a 2 stage trigger, I believe then the -1 and -2 were pure single stage.
What I have read in the many years here on the forum, the only people that said they broke the extractor was when they fired in excess of 350 rounds in the day, or between cleaning.
If you wish to read the article feel free any and all to e-mail me for a copy, I have model 41-46 articles as well, good reading.