This is a very nice First Model Richards Conversion with serial number 198146 from the Percussion serial range and has all matching numbers. It has well over 80% blue and case colors. This one has British Proof marks and Ivory grips. The cylinder is over 85% with a complete Engagement Date. The mechanical function is very good crisp and tight. The bore is very good bright and shiny with strong rifling. This is a very nice Colt Richards. The owner told me that the pistol went to Mexico with a U.S. Engineer and eventually came back about 30 years ago.