Hello-I recently acquired a Sheaffer Imperial Triumph fountain pen. From my research, mainly on Penhero.com, I found that these models were gold filled, but the level of GF was not specified. However, this pen only has the Sheaffer made in the USA hallmark. The pen came with a ballpoint marker 23K FLH (last photo), which I understand is from the South American market, meaning 23K Gold Filled. Can anyone tell me the amount of gold fill for the fountain pen, such as 12k, 14K, 23K? I have seen some listings for this pen indicating it was 23K.