I have A Kerr revolver Patent 9522 with 280 very plainly stamped on the trigger behind where the finger rest to pull it. Also has 280 stamped on the front of the cylinder. It hase a well stamped JS anchor on the grip. Has the holster. This Kerr has been in the Robinson family since the civil war. This revolver belonged to a confederate by the name of Robinson from either Brunswick or Greensville County or a close county. I have had it for about 50 years and that is the story I was told when it was given to me be my Dad. I to would like to know more especially since your number is 276 and so close to my number.It is in very nice condition to me. I do know these are very sought after and rare. I was offered 5 digit $ by a collector about 12 years ago. Mine too may be for sale for the right price. Hope this helps you some. Brander Robinson