Anomalous Great Basin Obverse - Coin Community Forum

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Author	Replies: 3 / Views: 1,287
publius Pillar of the Community United States 807 Posts	Posted 08/23/2013 8:10 pm I was sorting through my change, & came across a 2013-P Great Basin quarter. So far so good. But the obverse has the strangest surface finish I've ever encountered. I haven't attached a photo because I'm not sure how to get the effect to show up, so if anyone can give me some advice on that, I'd appreciate it — meanwhile, you're stuck with my verbal description. I can only describe the surface finish as "satin". Aside from a couple of bag-marks, it's extremely uniform over the whole piece. The general character is similar to a frosted surface, but much more subtle. Also, underneath the satin finish, the surface is a near-perfect mirror. The overall effect on reflected light I can best describe as a superposition of a Lambertian & a specular surface, with something like 80% mirror & 20% diffusion, so that close-by objects give a quite distinct reflection, but at certain lighting & viewing angles, the portrait almost completely disappears. Is this ringing a bell for anyone? Report this Post to the Staff

CoinDan98 Pillar of the Community United States 1053 Posts	Posted 08/31/2013 11:47 pm Interesting hard to tell without pics... Report this Post to the Staff
publius Pillar of the Community United States 807 Posts	Posted 09/11/2013 01:26 am Well, I'm still trying to figure out how best to photograph it. Maybe I can take photos from oblique angles, with the illumination from several different directions? I found a White Mountain with the same effect on both sides, & another with a weaker version, which might be an intermediate state in the progress toward a normal die appearance. Report this Post to the Staff
baysinger626 Pillar of the Community United States 950 Posts	Posted 09/11/2013 2:10 pm I know what you are talking about. I believe this is from an early die strike. As the die is used more it loses that frosty look. I see it on lots of new quarters. Report this Post to the Staff
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