Model 21-4 and model 22-4
22-4 45 ACP
21-4 44 special
22-4 45 ACP

21-4 44 special

I’d say the .327 magnums. Although that could be classified as an under appreciated cartridge as opposed to an under appreciated revolver, since they’re highly appreciated in other calibers.
My vote is for Smith & Wesson M 696----44 special. Very under rated.
My vote would have to be the
Model 14 as some others have
Said it is as close to perfection
As it gets.
If you can not do it with a model
14 you probably can not do it.
I think we're confusing rarity for being under appreciated.
If not many were made but they now command big $$$, that's not under appreciated!
I have to agree with model 14. I have a -3. Picked it up online for $410 shipped and insured. It looks good, and shoots quite well! BobThere are corners of this forum that would advance virtually every model produced in the last 40 years as being the best and least appreciated. My thoughts first fell to the 586/686 but those don't fall into the underappreciated column. I then thought of the many j-frames, but those have their aficionados. The big guns, N frames, also are worthy in the "best of" category, but only that. How many threads can you find on the virtues of the incomparable model 10? So, I go back to the model 14 in the pedestrian .38 special. I think the value of these guns in terms of aesthetics, function, and accuracy is often overlooked by those searching for sexier, a bigger bang, high capacity, conceal-ability, tactical-ability, stainless steel invulnerability, or ... something, are missing the essence of the target sighted, six inch barreled, blue steel, easy to shoot six shooter. I'll go back in my corner now.
http://smith-wessonforum.com/attachment.php?attachmentid=453152&stc=1&d=1590888096