The serial number suggests 1906/7 and the barrel marking means it will take 32 short or long Colt ammo rather than 32 S&W or Colt NP 32. That age and caliber suggest it does not have the positive safety lock unless it is marked "Police Positive" on the the right hand side of the barrel (I have one with that safety marked "New Police" on the lock plate and "Police Positive" on the 6" barrel in 32 Colt)
If it doesn't have the positive safety it's probably best to leave the chamber empty under the hammer like a Single Action Army.
If it doesn't have the positive safety it's probably best to leave the chamber empty under the hammer like a Single Action Army.