Here for your perusal is my S&W British contract Triple lock revolver serial number 4367 still in original .455 Eley chambering. I've sent off for the S&W Letter of Authenticity so should have shipping data in a few months.
Got the S&W Letter in just 3 weeks showing this pistol was shipped from the S&W factory to Remington-UMC NY purchasing agents for the British Government on January 7, 1915; details below: