The top of the barrel has a date of what looks like "12.29.14".
And there's not a SN # on the bottom of the grips, but, it looks like it is on the front of the grips.
Welcome to the Forum. You have a 32 Regulation Police revolver, that would have shipped from the factory around 1920. The caliber is 32 Long (not rifle). This model is an I frame.