1974 1 Oz Certified Mint Alaska Pipeline Round BU

Hard to find the Certified Mint Alaska Pipeline round. Certified Mint produced a set of rounds from 1974 through 1977 commemorating the building of the Trans-Alaska Pipeline. The rounds, though branded by Certified Mint, appear to have been minted by Letcher Mint.

Obverse: The obverse depicts an oil worker guiding a pipe into place. Oil rigs dot the landscape in the background.  The date "1974" is inscribed prominently above the oil worker. An upper inscription that reads "IN COMMEMORATION OF THE" is completed by the lower inscription of "TRANS-ALASKA PIPELINE". 

Reverse: The reverse is simple, consisting only of four lines of text decreasing in size. The lines of text contain the name of the mint "CERTIFIED MINT", the weight of "ONE TROY OUNCE", the purity ".999+ FINE", and the composition "SILVER".