Yes a big difference between the Proof and regular strike,proofs are Struck multiple times under higher pressure using specially prepared, hand-polished dies and hand-inspected blank planchets to bring out sharp details,Edge Lettering: Consistently applied in a specific orientation ,Mint Marks: Produced exclusively at the San Francisco Mint (S).It's All in the Method of Manufacture,
Quote:On proof
Presidential dollar coins, the edge lettering is applied at the same time the coin is struck.
How It Works
• 3-Piece Expanding Collar: Unlike regular business-strike coins—which are lettered in a separate machine after striking—proof coins use a specialized three-piece segment collar that contains the lettering, date, mint mark, and mottos. (and that explains the Three bands on the edge inscription)• Integrated Struck: When the obverse and reverse dies strike the blank planchet, the segments of the collar expand outward and impress the design directly onto the edge simultaneously.
• Uniform Orientation: Because the collar segments are locked in place during the strike, the edge lettering on proof coins maintains a consistent, uniform orientation relative to the faces of the coin (unlike circulation strikes, which enter a secondary edge-lettering machine randomly and result in Position A or Position B variations)