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Fred CIs it my bad memory or am I recalling that the old price guides used to indicate that you would probably have to pay a "small" premium if you were to purchase a silk with a backing. I think the same was true for cards that had the coupons removed. I always laughed at this because even 30+ years ago you knew how difficult it was to find the item with the "little extra" still attached to it.
You can also look at the chronological listing in the SCD guide to tell you which page to find the checklist.