Tough question
The 1958 Kahn's in my experience are far and away the toughest of the Kahn's issues (excepting the Frank Robinson which for some reason seems to be more available). In fact the Clemente is a "grail" card (only a single example has sold publicly in 30 years I have been watching). There are actually 4 of the Post card in the PSA pop report + yours in the SGC report. I'm going to offer an educated opinion/extrapolation of a wide range in terms of value. That is $150-$350. The thing holding it back from being significantly more valuable in my opinion is the set and therefore any of the non-stars in it are relatively low demand - there are only 3 sets listed in the PSA set registry - the #1 set has a Post, The number 2 set is at 33% completion and the #3 set is under 10%. I am going to surmise that the #3 set for sure and possibly the #2 set are not being proactively "worked on".
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