if a ddr has a ddo associated with it can it be used as a marker? if something happened to the obv die and it was switched out that ddo would no longer be present right? how would you then be able to accurately identify it? if we need a specific coin to make it easier I was looking at the perry's victory OH-WDDR-003 coupled with WDDO-003. http://doubleddie.com/1445861.html
There is a very strong possibility at some point during the die's life it will be matched with a different die since the mint is more concerned about the obverse die quality than the reverse. For example, the 1948-d Franklin half DDR-003 fs-801 is only matched with DDO-003 during Stage C of the die's life. A ddr/ddo can be used as a marker for certain stages of the opposite, but it is no guarantee.
exactly the problem I having. I had a couple minor ddr's that I was trying to attribute too but obv markers were not present. like die gouge or dot etc. so...what do you in a situation like that?
First it's important to know the differences between true doubled dies and mechanical/die deterioration doubling. Once you can identify mechanical and die deterioration doubling pretty well, you can eliminate a huge amount of possible doubled dies without spending much time on them. Then I use respectable sources such as VarietyVista to find high quality photos of individual features. Coinfacts or HA are invaluable sources to find images of known varieties in high resolution- often being able to compare markers during different die stages. I even like to pull up ebay listings of classified/slabbed varieties to see how the features appear in ebay-seller's crappy photos. It's important to recognize the exact features of an individual variety. Die cracks, gouges and scratches are extremely useful, but not completely surefire since they will change during the life of the die. The features of doubled die can become weaker later in a die's life, but they are otherwise unchanging.
