Great find! Congratulations. That's the first sporting Kennedy I've seen with a Springfield rear sight. Very interesting. Does it have a prefix ahead of the serial number? The brother yours is in my rack, also 45-60 but no set trigger. It is E4XX. It is supposedly from the first batch made in the 1876 Winchester calibers. It is a great shooter, especially with the heavy Marlin 45-70 bullets.