I would highly recommend getting a one day subscription to VCP, which I believe costs less than five dollars. From there, you can pull the prices for all of the cards you have. Note that the SGC Mantle values are skewed a bit towards the lower side because there have been a couple of really abused ones switching hands. But, BVG or PSA should be a good comparison, just look at the pictures and find one as presentable as yours.
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Mantle Master Set - as complete as it is going to get
Yankees Game Used Hat Style Run (1923-2017): 57/60 (missing 2008/9 holiday hats & 2017 Players Weekend)
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