Whats the difference between a pr69dcam and a pr70dcam? If it helps for reference please use a 2012 Jefferson s. Looked on their website but couldn't find a definitive answer.
The answer is very very little. Usually the difference between a PR-69 and 70 is a tiny break in the frost of the devices of a coin. It will usually take a jewelers loupe to find it.
Sometimes it's as minute as a couple of contact points on the rim that are no longer visible after its slabbed.
From my experience, the difference between a proof-69 and a 70 is that the 69 has a very small break in the frost somewhere on the devices. I personally think this is such a small difference that I don't even worry about it. PF69 is good enough for me.
It usually is a pinprick sized hole in the frost (like this) This coin is a 69DCAM. As you can see the arrow is pointing to a minuscule hole in the frost.
That's actually not true. If you had read the previous responses you would have seen the difference. The difference is minimal (and to many including myself is negligible)...but there is a difference.