Lucy commented on my Mango Fork post (See July 9, 2010). Upon further research, I found that most Mango forks by American manufactures are in Silverplate patterns, not Sterling. The 1911 Louis XVI pattern by Community Silver, which is now Oneida, is silverplate and does have a Mango fork, as do Primrose (1915) and Patrician (1914) both older Community Silver/Oneida Silverplate patterns. These patterns have been discontinued.
Another pattern Lucy mentions is Holly, by National/ EHH Smith (1904 - since discontinued) is also a silverplate pattern. I could not find a mango fork listed.
Also, I found a reference to the 1932 Doric sterling pattern by Manchester that had a Mango fork in it, but I could not find a picture or description of the piece itself.
I will keep an eye out for more Sterling Silver Mango forks as I move forward and plan to add Ms. Graber's book to my collection of resources. Thank you, Lucy, for your interest here.