Unstruck Barrel Weight question

[Researcher]

From my observations the Kf was the barrel steel mark for the steel Parker Bros. marked as "Vulcan Steel" on the rib legend, from their introduction up into the 13xxxx serial number range when we begin seeing the V in a circle. The guns marked "Titanic Steel" and a very few marked "Acme Steel" on the rib legends had a K in the barrel steel location on the right barrel flat.

131783 03 K in barrel Steel Location.jpg

[Liftengineerdoc]

Researcher, thanks for that input! Nothing further on the flats, except the Pat'd date of April 11, 1878 and the "- 2" as shown in my other photo. S/n of this Parker is 113823, in line with your info provided (thank you).

A further question, if you can answer it, the "end" of the rear bottom lug has an 8 and a 3 on its face. Its below the lug bite. Is there any significance to this?

dws