It is my understanding that, if the gun is marked Colt D.A. .38, which that one is, it is chambered for .38 Long Colt and .38 Short Colt, but not .38 Special.
Regarding marking the gun for .38 Special, as far as I know, Colt used that phrase -- .38 Special, or .38 Colt Special -- to denote those guns so chambered.
I may be wrong about that.
I do know that Colt only made this particular model in .38 Special for about 3 years, and apparently in quite limited numbers
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.