Hi, Yatahaze. All the one-green-stripe Prince Graphites I've ever seen had "Prince" in green at the throat.
Is it possible you saw a Prince model other than the Graphite? There were some models in the 90s, for example, that resembled the Graphite (thin beam, cross bar) but were different models from different molds. One giveaway: the Graphite II, Precision Graphite PL700, Precision Longbody 730, Michael Chang models, and maybe others were not quite box beams, and their crossbars had a slight curve that the Graphite's crossbar has never had.