The lowest priced signed item would be for a "cut Signature." A cut signature is a signature on a piece of paper, or "cut" from a larger piece. Index cards are the next step up, and both sell at a fraction (about 10%-20%) the price of an autographed Baseball. Autograph photos typically sell at about 40-60 percent the price of a baseball with bats, uniform Jersey's and equipment selling at a higher price due to the higher cost of the item, rarity and display.
In general if an autographed baseball is worth $100. the same autograph on a 8x10 photo $50. a cut signature $20. on a bat $150. The percentage of the price could also vary based on the popularity of the player, and how sought after the signature is. A Restaurant Tab will fit into the pricing of a cut signature or index card at about $60.-$120. unless the restaurant tab is from one of Mickey Mantle's establishments. Because of the quality of the paper used the price will be kept down. This paper can rip more easily, and if not properly taken care of will brown. A collector might not spend as much money on a signature that could be easily destroyed. The bulk of the value will rely on how well the signature is displayed, and the type of authenticity that accompanies the signature.
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The Mickey Mantle signed napkin would be in value as a Cut signature which is worth about $50.-$120. Prices will vary based on type of authenticity, and condition. Signatures that are not authenticated could sell at half the market value or less. Mantle has signed many bar napkins and the humorous inscriptions that follows if any will add the bulk of the value. The problem with a signed napkin is the low quality of the paper used. This will also dictate the value as a collector will not plop down a load of cash on a signature that could be easily ripped or ruined. With this said the value could drop from the price stated above.
A signed copy on the inside would sell for about $75. -$150. And signed on the cover about $150. -$200. value will vary based on condition and the type of authenticity that accompanies the signature.