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BobChecking with VCP, the average price of the last 11 PSA 7 Williams #250 sold on eBay is $738. I feel that eBay is a better gauge of the true value of a card than the more glamorous auction sites. There have been only five PSA 7 Williams #1 sold on eBay in the same time period with an average price of $1,079.
Even more striking, there have been zero PSA 8s of card #1 (average price of $4,389 in other auctions). There have been three PSA 8s of card #250 on eBay (average price of $2,647). Three other PSA 8s of card #250 have been in large auctions with an average price of $4,257.
Card #1 seems to be more expensive and harder to find. Here's mine that I just got in the Goodwin auction:
Note: Vintage Card Prices has been an invaluable resource for me when deciding what to bid. Undoubtedly I've saved more than the cost of subscription.