I love J-frames! If I could have only one handgun, it would be a J-frame! Really.
I started carrying my first one, a Model 36, in an ankle holster in the late 60s because the holsters we carried our duty revolvers in made the guns almost inaccessible in our patrol cars.
The little J-frame, in the ankle holster on my left ankle, was very easy to reach from the seated position.
After leaving policing, and finishing law school, I became a Prosecutor and carried a nickel Model 37 with a bobbed hammer. Foolishly, I sold it to buy some other gun and I can't recall what it was.
I soon settled on a Model 38, then the 638 when they came out. I found them as easy to conceal as a 642 and the way the frame was engineered fit my hand a little better.
Foolishly (is this getting to be a pattern?) I sold it to my friend, a LEO. He left it in his car and, yup, some stinking burglar has it now.
I've been looking for another Pre-lock 638 for a few years now. I "think" there were two on here for sale since I started to look, but someone beat me to them.

Otherwise, I haven't seen any (I'm not a fan of GB, so I don't buy there).
I am certainly okay with one of my two 642s, just have a hankering for the 638 which is, I'll bet you are surprised to read, the J-frame I'd recommend to you or anyone else who asked.
Bob