4 vintage chairs

I do not know much about the history except that my grand father bought them for his office.They are very solid. They have an inlaid cane type back (Mostly in tact on most chairs). They have  a green vinyl square sturdy cushioned seat. Very clean line. Very nice chairs. I am assuming they are from the 50's. They are a square design with a dark (almost black) teak wood frame with 2 squared hand ralis. Very nice chairs. I am curious the value as I have no idea. Thank you so much.

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