Hello there,  I was hoping to get your help on this as I cannot find anything about it.  It is a metal fork with U.S.P. imprint and a J imprint, it is a MODERNAIRE 1.   I have seen U.S.C.G. and U.S.N. on these items as shown on these listings on ebay but nothing as significant as a United States Penitentiary item possibly from Alcatraz.
 I have searched Google and various sites about it and cannot really find a lot of information.  I looked up the acronym U.S.P. and found that possibly was for United States Penitentiary or Utah State Prison.  I know the United States Penitentiary's were federalized in the 40's, and so on.  I was thinking possibly from Leavenworth Penitentiary or even Alcatraz, and was wondering if they even had metal silverware at those facilities at that time for staff or inmates alike. Anyway the pictures tell the story and I have attached 5.