Re: any info on this gun
That gun looks odd to me. It is not an 1889 Navy nor is it any of the 1892-1905 service revolvers or their civilian versions. I think it is a .32 Colt New Police, but the barrel marking is wrong.
I think it began as a .32 Colt NP, then someone put on a .38 Army/Navy barrel, cutting it down in the process (note the marking is further back than it should be) and obscuring the caliber in the process. I suspect that the cylinder was reamed for .38 or the barrel was sleeved, more likely the former. The result would have been a small, light revolver in .38 caliber.
Note that I am doing more than a little guessing here. But that gun has a lot of contradictions I can't explain any other way.