The rest of the story:
The 44 CF stamp is correct according to
A STUDY OF THE COLT SINGLE ACTION ARMY REVOLVER, page 42:
"This "44 CF" stamping was used by the factory to designate .44 caliber centerfire chambering until late 1885. A placement change for the stamping, from the rear trigger guard flat to the left-front trigger guard bow, was in progress during the 45000 to 50000 serial number range."
As a side note, it is also interesting that on page 50-51 they make this comment:
"In mid 1883, Colt's began applying all of their previously-mentioned frame markings to a new type of frame, one manufactured of steel. There is no factory record of this innovation. We learned of this manufacturing change--from iron to steel--in a letter from Colt's General W.B. Franklin, U.S.A. (Ret) to the Army's Chief of Ordnance, noting that the new type of Single Action frame material was introduced during completion of the April 9th, 1883 U.S. Government contract. It is safe to conclude that the changeover to steel frames also took place in civilian production very near, or before, that period, in about the 95000 to 96000 serial number range."
This gun is in the serial number range to have an etched "COLT FRONTIER SIX SHOOTER" marked bbl and has the 44 CF mark on the TG. When I got it, it had a COLT SINGLE ACTION ARMY .45 marked bbl and 45 cylinder. Upon dis-assembling it for inspection, I discovered the stamp "933" on the grip frame and the bottom of the frame. This indicates that the gun was returned to the Colt factory and some type of work was performed in September of 1933. My prognosis is that at this time it was converted from 44-40 to 45 Colt, refinished, and the trigger guard was stamped with the verified proof for smokeless powder, resulting in the incongruity of the combination of a 44CF stamp along with a VP stamp.
A call to the Colt Archive Dept verified that it was originally shipped in caliber 44-40 on June 13, 1883 to Hibbard, Spencer & Bartlett in a shipment of 53 guns. Since I just happened to have an etched FSS bbl and a 44-40 cylinder on hand, I decided to return it to it's original configuration.
Here is the final result:
