Posted 10/07/2018 10:20 am
"RPMPs"
The second theory is that of an RPMP. Picking up with the making of the new punch in the above scenario, all that is necessary here is to see the defective punch as actually a doubled punch. Stage A coins show only the defective bulge or knob. As cold working occurs, stage B (split upper serif only) coins begin to show. Fairly quickly the doubled image bursts out in full color (stage C). As the punch continues to be used across all denominations the doubled image fills in or wears off. The key here seems to be in the fact that no stage B (split upper serif only) coins are known for 1975 or Bicentennial coins, while stage C (full doubling) are known for both 1974 and 1975. The 1974-S doubled mintmarks, while not common, are nonetheless available. It is difficult to find the 1975-S and Bicentennial doubled mintmarks. This tends to indicate that the RPMP began to wear off early in the die production cycle of 1975. Of course this does not mean that true RPMs do not exist for 1974 and 1975. The prime example is the 1975-S Roosevelt dime RPM-001. There is no mistaking this as a RPMP.
The second theory is that of an RPMP. Picking up with the making of the new punch in the above scenario, all that is necessary here is to see the defective punch as actually a doubled punch. Stage A coins show only the defective bulge or knob. As cold working occurs, stage B (split upper serif only) coins begin to show. Fairly quickly the doubled image bursts out in full color (stage C). As the punch continues to be used across all denominations the doubled image fills in or wears off. The key here seems to be in the fact that no stage B (split upper serif only) coins are known for 1975 or Bicentennial coins, while stage C (full doubling) are known for both 1974 and 1975. The 1974-S doubled mintmarks, while not common, are nonetheless available. It is difficult to find the 1975-S and Bicentennial doubled mintmarks. This tends to indicate that the RPMP began to wear off early in the die production cycle of 1975. Of course this does not mean that true RPMs do not exist for 1974 and 1975. The prime example is the 1975-S Roosevelt dime RPM-001. There is no mistaking this as a RPMP.
