It is a bit hard to tell from the pics, but I think that is the .38 Safety second model. If so, the serial number should be between about 5125 and 42483, probably in the lower part of that series, and the gun was made between 1887 and 1890.
The only drawback to shooting those guns is that they are old and fragile and parts are almost non-existent.
There are modern concealed hammer S&W revolvers with the grip safety, but they are of the much stronger swing-out cylinder type, not the old top break.
Jim
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