It would appear, though I am no expert, that the gun shown in the pictures is a Forehand and Wadsworth Swap Angel. In the folder of pictures you linked, there is one showing manufacturer's marks, and despite being hard to read, clearly identifies it as a F&W. Searching Google images for this model yields photos of similar guns.

As to why the photos also identify it as a Smith and Wesson: I suspect that it is an attempt by the individual hosting the photos to get them to show up when people search many different topics, hence the long photo names with lots of additional models, brands and other words thrown in. This practice is often referred to online as "tagging". The idea is to attempt to market the material to a wider audience.

Edit: a little cursory research suggests that the F&W Swamp Angel was not in fact a suicide special as another poster had suggested, but a fairly accurate and reliable gun, that was apparently well liked in its time.