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Dave the SMR is best used to wipe your bum with or blow your nose in to. It is almost a worthless guide as far as valuation of vintage cards prices go. just compare your favorite vintage tobacco card sets listed values, and then check Ebay, and other auction results, and even the BST area of this forum. prices listed for cards in the 1-7 range are not consistent and often much higher than the SMR lists. perhaps they need to do some more research on the current market that they have helped create.
I'm still trying to figure out why SMR exists other than for self promotional purposes for PSA.