Wilt Chamberlain 8x10 (team issued?) photo help..
 

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I recently purchased this Wilt Chamberlain 8x10 and was wondering if anyone knew what year it is from. It looks very similar to some team issued photographs I've seen of him (one from around 1960, another attributed to 1964 and one from 1966 or 67).

Thanks!
-Frank

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