What caused this?

[N-7446]

This 1973-S Ike in proof hard plastic has a metal blob near IN and TRUST which goes a around little in both directions. What caused this?

WIN_20230831_13_57_10_Pro.jpg

[occnumis2021]

a very nice close-up but sometimes, there is a such thing as too close. i gotta say it looks like a big die chip but despite how good the image is, it could be a little more effective. maybe a couple images at angles and different distances. (i know proofs can be more difficult) the other images can help to rule out other things it could be. (unless someone that posts here has seen it before which is entirely possible)

[N-7446]

Thanks for responding. Here are some not as close pics from multiple angles.

PXL_20230901_031938733.jpg PXL_20230901_031930523.jpg PXL_20230901_031955241.jpg PXL_20230901_032013861.jpg PXL_20230901_032006296.jpg PXL_20230901_031921949.jpg PXL_20230901_031946404.jpg

[N-7446]

It looks like glue from some angles. Do the hard plastics have glue around each coin? I've never cracked any...

[MintErrors]

In my opinion it is tough to tell what it is.
It could be:

• Grease
• A very slight oversized planchet that did not quite fit in the holder. Maybe some of the plastic sheered away when the coin was inserted.
• A scenario where the set was cracked open prior to you owning it. Maybe the person who did it swapped a high graded coin for a lesser one and did not do a stellar job of hiding his tracks. You would have to see if the original tabs for the proof set case are intact.
• It could be just a bad job at Quality assurance.
• It could be hundreds of other reasons...

[N-7446]

Thank you for the response. I'll set it aside and possibly crack it open to see if I can learn anything new.