With your information and what I have been able to glean off the Internet, I can attest that there was at least one New Service Target made with a 6½ inch barrel. Everything else matches exactly, including “a top frame that was lightly stippled, a checkered trigger, checkered grip straps, and adjustable front and rear sights.”. However, my pistol has checkered walnut grips with a diamond relief and the silver Rampant Stallion medallions. The serial number puts its manufacture in 1916. Thank you for the help.