Doing a little bit of Googling it appears that this is a Sumitomo built Yale that was not supposed to be here built for the Japanese market via the partnership NACCO has with Sumitomo.
Looks like the actual model is the 03-FG15PVDS. Most likely you are going to have a hard time getting parts for it unless some of the lads on the other side of the pond can shed some light on part numbers.
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