Now, Edwin Wesson (Daniel's older brother) was famous for his percussion target rifles and pistols, and Daniel apprenticed under him when he was young. Edwin was famous for inventing the false muzzle for muzzleloading rifles which aided in helping extreme accuracy.
The book History of S&W
written by Roy Jinks gives a complete history. (However, there are much cheaper places to get a copy than amazon- like the S&W website)
I do have one example of an original Wesson target pistol in .31 caliber.