I have this '82 Proof (DCAM) quarter that has a 2nd profile and I am certain it is not MD or DDD and ruled out a die break. It looks like an artist's sketch line when doing a painting but not an exact match to the profile. It would be really nice if it were a DDO for a discovery, but I'll take any insight as to what this is???? I did not break it free so all pics were taken through the plastic, but I'm sure you'll see what I'm talking about. Please enlighten me...
I'm not entirely sure what this is, just from these pictures, but I'm not convinced it is MDD. It isn't flat and shelflike at all. I would also expect any MD to be shiny - this area under concern is cameod just like the rest of the profile. This tells me it is a die effect, before strike.
No shelf, it's at the same level. Not flat and shelf like at all. I've never seen anything like this before. It's like an outline on the inside of the profile.
Total, complete, and absolute speculation: This does not appear to be hub doubling. It doesn't have the appearance of a doubled die. This cameo was made during the era of sandblasting the devices. They put a gasket over the coin to protect the fields, and then sandblasted the devices. What would happen if the gasket shifted during this process? I might expect to see some sort of shift or disturbance in the cameo pattern. Could this happen? Did this happen? I feel like we need some more experts to weigh in on this one: @JCro57 , @Fred Weinberg , @cladking
So you're saying it shifted a bit between strikes? I suppose I could see that. Are there other confirmed examples of this?
Modern proofs - after 1964 - are struck twice using a special press. One would reasonably expect to see some slightly doubled impressions. Examples? I can't find one now. Maybe the coin in question?
Based on the photos, it's a very slight shift between the two strikes of a Proof coin - similar to mechanical doubling (MD) that we see on circulation strike coins. Yes, the shift is a bit more than most that show this effect, but it's not a doubled die, and I wouldn't consider it a double strike, as Proofs are struck twice anyway. I have numerous double struck Proof coins (from the mid-70's) that are double strikes, and show a completely different look to them, even the ones with close overlapping.