I agree with Leon on this. With a dealer you would be very lucky to get 50%. I have made a few trades like this and the person with 1 card always gets a premium compared to the guy with a stack of cards. When trading with a dealer you have to consider all the extra time it will take them to unload the lot compared to the single card.
As an example I traded a rare Joe Dimaggio for almost a complete run of Willie Mays cards and received about a 20% premuim for the single card.
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