The Kf on the right barrel flat of 130830 is the steel mark equating to Vulcan Steel. On the early steel barrel guns the Kf equates to Vulcan Steel and K is found on both Titanic steel and early Acme Steel barrels. We find the K and Kf steel marks into the 134xxx serial number range in the 135xxx range we begin seeing the letter in a circle steel marks -- V for Vulcan, P for Parker, P.S. for Parker Spec., T for Titanic and A for Acme.
On 196846 the HT over A on the right barrel flat is believed to mean High Tensile Alloy by many and Heat Treated Annealed by others.
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