The Army Special looks like a late one from the markings, not really any different from an Official Police. The rubber grips are Pachmayrs, about 50 years newer than the gun. Pity, it is in nice shape and worth a bit of money. Colt revolvers are hard to get fixed if you manage to break one, but they are not fragile flowers. They led in police sales until well after WW II.
Standard velocity .38 Special is not loaded any hotter than it ever was, the gun should shoot 158 gr lead roundnose or 148 grain wadcutters approximately forever.
The Iver Johnson "Owl Head" is likely a .38 S&W. Not .38 S&W Special, not .38 "Short."
Again, ammo is not loaded any hotter than it ever was; but this gun looks a bit neglected. I would look at it closely before I shot it. But then I would probably go ahead and shoot it. But not a lot.
The little Colt .32 Pocket Hammerless is a sweet little pistol. This one may be reblued, the lettering looks a bit rounded, but it is in nice shape. Again, it will shoot fresh .32 Auto (ACP) ammunition without any trouble. It is not much trouble to field strip into three pieces, barrel, slide, and receiver assembly, but is tedious to put back together if taken completely apart.
The Smith & Wesson looks like a Chief's Special Model 36, a standard in the industry.
The one you don't show here is a Llama, if marked 9mm Corto is the same as .380.
Not as fine a gun as the Colts and S&W, it is in good condtion and worth having.