The left side of the barrel: COLT (then in 2 lines) Army/Special (and then) .38
If so, You have an Army Special model, chambered in .38 Special (will also shoot .38 Long Colt) and the serial number dates it as having been made in 1922. While it is safe to shoot some brands of Plus-P ammunition, there are others that I wouldn't recommend, and staying with less powerful standard loads would be wise considering the revolver's age, and the fact that if something broke finding period repair parts and a qualified gunsmith to install them might be difficult. Using used parts from another gun may or may not work, because at the time it was made Colt individually fitted each one.
Your .22 Officers Model was made during the first year of production, which would be 1930.