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It is odd. Makes me think of past & future
He is a "self taught" artist - meaning no formal training, per se, When an artist like this does work, it generally will not be included in art date bases.
I did find his page though - here ya go: http://folsomarts.org/members/john-hester/
That may or may not be the same John Hester. The signature looks quite different, but some artists change their signature over time. You're in luck - there's an email in the link vicki gave you and you can ask if he did it.