The serial of the best one I have is 15001. It has no proof marks of any kind. The barrel is marked Smith & Wesson .455 on the left side and blank on the right side with typical patent data on the top. It is a 6 1/2" barrel.
Most likely # 15001 is from the third batch of TLs assembled at the end of the Brit contract that are also numbered in the 44 HE 1st Model (TL) serial # range in category #3 below:
The 3 Versions of Hand Ejectors chambered in .455 Mk II for the British are:
1. .44 HE 1st Model TL, with .455 Mk II chambering: 812* factory reconfigured unassembled or unsold ".44 Spl HE 1st Models", often not .455 stamped, original chamberings unknown, 666 for the British #1104 thru 10417, the extra 146 #9858-10007 for the commercial market; 123 in England and 23 in the US [N&J pgs. 204-205]. These 812 .455 TLs were serial #’d in the .44 1st Model serial # range of 1 to 15375. Shipped 1914-16.
* SCSW reports "over 800", but by serial # count, it’s actually 812, 146 of which are commercial guns [S&WN&J pgs. 203, 204 & 205].
NOTE: Of the 146 .44 HE 1st Models that were converted/built as .455s assembled some time after the first 666 military .44 1st Model .455 TLs and sold commercially, 123 were sold to the British, shipped to Wilkinson Sword 10/1/14 and 23 sold in the US, shipped to Shapleigh Hardware in St. Louis, MO. shipped on 1/1/1918.
The 23 at some point were converted to .45 Colt and it’s unknown if by the factory before shipment to Shapleigh or after delivery to Shapleigh. However even IF converted by the factory (as suggested in the September 2013 Rock Island gun auction narrative), the revolvers would not have a star on the butt or a rework date on the grip frame because they did not go back to the factory for conversion as rework, they were converted before they left the factory.
2. .455 Mk II HE 1st Model, TL: New .455 British serial # range 1 to #5461 [H of S&W pg. 201] made 1914-15. Thus creating a possible c. 68* of the 812 serial #s above duplicated with the .44 1st Model .455s.
3. .455 Mk II HE 2nd Model: continued in the .455 1st Model Brit serial range beginning #5462 to #74755, made 1915-17. Feb 1916 724 manufactured for the Canadians, chambered in 45 Colt, presumed for the RCMP [H of S&W, pg. 203]. Canadians also bought 14,500 2nd Models. And 1105 2nd Models released for commercial sales in the US, shipped Dec 1917 to Shapleigh Hardware in St. Louis [S&WN&J pg. 216].
“As the Brit contracts were finishing up in [April] 1916, S&W found enough parts to build 691 .455 Triple Locks. These guns will be numbered in the 44 serial number series [H of S&W, pg. 203]. I have no idea why they were not just numbered in the .455 series. Perhaps it was .455 barrels and cylinders that the factory found, and they simply turned again to existing 44 frames to use them up. They were sold commercially.” Lee Jarrett
*About Duplicate serial #s:
Duplicate numbers of the 44 HE .455 TLs 666 (#1104-10417 44 HE range-not all inclusive) + 146 (#9858-10007 44 HE range- not all inclusive),
with 68 of the .455 HE 1st Model TLs (#1 – 5461 in the Brit range),
and with the .455 2nd Models (#5462 and up to #15375-the last .44 HE 1st Model serial #) in the Brit # range.
But the 691 are likely numbered too high to possibly have duplicate numbers to some of the .455 HE 1st Model TLs in its serial range #1 to #5461, but we don’t know that for sure.