I have recently acquired 42266, a 2nd Model HE. Typical patent dates on top, left side of the barrel is rollmarked "Smith & Wesson .455.", then has a crossed pennants mark in line with the barrel just above the yoke. At the back corner above the thumbpiece it has the typical "broad arrow/ crown/ inspector mark/ E/ II" stack. No other added marks: no Birmingham code, no bursting bombs, no double-arrow removal point, no other marks than the serial number on the butt. Serial numbers match, but the one on the back of the cylinder is gone, as the cylinder was cut for ACP moon clips. It's not a safe queen, nothing a collector would want, especially with the cylinder cut: a lot of honest wear, nicks and scratches, bluing worn. (Any other details needed, just ask).
Regards,
-L