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Message:: [QUOTE="GDJMSP, post: 5402987, member: 112"]They do exactly the same. The surfaces of business strike coins are just as delicate as they are on Proofs. If it hairlines a Proof, it will hairline a business strike too. The only difference is that it is much easier to see the hairlines on a Proof. The delicate part on a coin is the luster. And luster is ridges created by metal flow. And the peaks of those ridges - that's the most delicate part, the most fragile. On a Proof, think of the ridges of luster like this - /\/\/\/\/\/\ On a business strike, like this - /\/\/\/\/\ The Proof ridges are much smaller and much closer together because of all the additional polishing done to both planchets and dies. And the mirror finish makes any disturbance much easier to see. [/QUOTE]