Nice Shooting Master, is this an offset hammer? it appears to be canted to the right hand, which seems to be for a left handed person. Also I noticed the white outline rear, the front sight seems to have a bead and is not the standard Patridge blade.
his gun may have had some modifications done possibly by Kings, or Roper. Any other markings on the hammer? The checkering looks very nicely done though. Hopefully some more advanced NS will be along to give their expert views and comments.