It appears by the image that there's two different finishes. The slide looks bright and the frame is more dull. I have a few non-factory hard chromed handguns and some factory nickeled. The finish on all are intentionally consistent. It's interesting that, (apparently from the image,) that this 41 has two different looking ending finishes.
It's most likely we won't hear back from the original poster. I hope I'm wrong though.
There was "a guy", (now passed,) who did a few custom S&W 41's. According to his working partner, (now passed,) hard chrome was the preferred choice not just for the look but for the durability. I was told to grease the rails on mine to keep everything purrfectly happy. I applied that suggestion to my other hard chromed, nickeled and all semi's since.
Jim