A 625 should be 45 Long Colt right?
Yes & No, made in both chamberings.
Nope, 45 ACP using full moon clips or 45 Auto Rim cases. Full moon clips are the perfect speed loaders. Having said that I have seen the 625 Model of 1989, which is what the pictured gun is, chambered in 45 Colt. The 45 Colt version is not very common. I've only seen one or two in person.
That would be the Model 1917 Army, made by both S&W and Colt as a stop gap for slow production rates of the Model 1911 during the Philippine Insurrection.