Kevin in (AIA) "Mr, Joseph King (Mr. Earl Tilton's son in law) said that the anvil maker would often put the first initial of his last name to the left of the weight on the front of the foot. Six of the anvil makers at Columbus Forge and Iron were: Mr Anderson, Mr, Cy Wright, Mr. Karl Wright, Mr. Cheeseman, Mr. "Doggie" Taylor and Mr. jack Ruble.
Many of the Trenton anvils Mr. Postman has recorded had Ws. Zs and Ts as well as other letters stamped to the left of the weight.
I did not come across any last names that started with a K.
Your Serial # 130980 dates your anvil at the year 1915