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In 2012 was rediscovered the #54, at least so far publicly known the highest number of the serie, in Longwood Gardens. "They found it under a staircase in a barn... No patina. Looks like it has never been out in the weather" Reference: Newsletter of the Mt. Cuba Astronomy Group (December 2012) "About a hundred instruments were sold" Reference: A brief autobiography by Russell W. Porter (Sky and Telescope Nº62, December 1946, Pag 13-23) Please, if the PGT has been digitized with your program consider sharing it with a link.