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<p>[QUOTE=&quot;19Lyds, post: 871010, member: 15929&quot;]The proof reverse types are the same definitions which is how the 1972 Type 2 Business strike came about. It&#039;s a business strike coin with a reverse intended for the 1971-S and 1972-S 40% Silver Proof coins. The Type 2 reverse is also used on the 1972-S 40% Silver Business strike coin (blue pack).</p><p>&nbsp;</p><p>The RDV-006 on the 1971-D was also intended as the proof reverse for the 1971-S and 1972-S Cn Nickel proofs which were never produced.</p><p>The San Francisco mint has been the producer of all proof set coins since 1968. Any proof dies (or planchet&#039;s) that were not of high enough quality, were shipped to the Denver Mint (except of course the obverse die&#039;s since these may have already received the S mintmark.......but you never know) and ultimately used in production. </p><p>&nbsp;</p><p>There is hard fast evidence supporting this in the existance of 1969-D through 1972-D &quot;Type B&quot; reverse Washington Quarters. The Type B Washington reverse is the reverse used on the Washington Quarters from 1937 through 1972. These Type B Washington Quarter business strikes are, at the moment, very rare to find but do exists thereby proving the die/planchet shipments to the Denver mint.</p><p>&nbsp;</p><p>Another piece of evidence is the 1974-D Kennedy on a 40% silver planchet as well as 1974-D and 1977-D Ikes on 40% silver planchets.</p><p>&nbsp;</p><p>The 1971-D IKE&#039;s also are available minted onto proof planchets so the evidence is overwhelming that the US Mint intended to produce Copper Nickel proofs for the Eisenhower Dollar but due to production constraints, did not and shipped whatever was reserved for the production of these coins, to the Denver Mint.</p><p>&nbsp;</p><p>Now, back to the OP&#039;s question.</p><p>&nbsp;</p><p>There could be some very rare IKE&#039;s out there that have mismatched OBV and REV dies. One that comes to mind is the 1971-S 40% Silver Proof IKE that has a Type 1 reverse. This is a big ticket coin and it&#039;s existance suggests that possibilities abound. But.......only if you know your obverse and reverse Type&#039;s and WHAT coins they SHOULD be on.</p><p>&nbsp;</p><p><b>RDV-001</b> = 1971-S Proof (extremely rare), 1971, 1971-D, 1972 Type 1 Business Strikes</p><p><b>RDV-002</b> = 1971-S and 1972-S Silver Proofs, 1972-S Silver Business Strike, 1972 Type 2 Business Strikes.</p><p><b>RDV-003</b> = 1972 Type 3 Business Strikes, all 1973 strikes (proof and business), all 1974 strikes (proof and business), all 1977 and 1978 Strikes (proof and business)</p><p><b>RDV-004</b> = All Type 1 BiCentennial strike (proof and business) and the single 1976-S 40% Silver business strike.</p><p><b>RDV-005</b> = All Type 2 BiCentennial strikes (proof and business)</p><p><b>RDV-006</b> = 1971-D</p><p><b>RDV-007</b> = 1971-S Prototype Strike</p><p>&nbsp;</p><p>If you find something that does not match the above, I would advise getting an expert opinion since you may have found a modern day rarity![/QUOTE]</p><p><br /></p>

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