Strike-through error? Repeating circles

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gyoschak Numista team
Joined: 4 Mar 2014
Posts: 657
Posted: 8 Jun 2024, 23:46 #
Edited: 10 Jun 2024, 01:26
Posted: #
Edited:

Has anyone seen this on a Seychelles or other coin? It is a pattern of circles throughout the entire planchet, both sides, and 90+% of the pattern has survived the striking process.

N#19424

edit: retitle thread

rsirian1
Joined: 20 Nov 2020
Posts: 12943
Posted: 9 Jun 2024, 00:00 #
Edited: 9 Jun 2024, 00:04
Posted: #
Edited:

Looks like a strike through error. Something (paper, piece of fabric) gets between die and planchet and transfers texture to coin.

 

Idolenz Catalogue referee
Joined: 13 Jul 2013
Posts: 9579
Posted: 9 Jun 2024, 00:07 #
Edited: 9 Jun 2024, 00:09
Posted: #
Edited:

Is it texture or just surface oxidation? I had some cheap privately packaged coin sets that left similar marks on some coins.

P.S. also nice macro pictures, what is your setup?

Mr. Midnight Catalogue referee
Joined: 10 Mar 2017
Posts: 4329
Posted: 9 Jun 2024, 18:11 #
Posted: #

The pattern is on both sides pretty evenly.

I like the theory of the textured vacuum plastic. Add some heat, and a few years in a window, then peel away the plastic…

Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac
gyoschak Numista team
Joined: 4 Mar 2014
Posts: 657
Posted: 9 Jun 2024, 23:53 #
Edited: 9 Jun 2024, 23:54
Posted: #
Edited:

It does not appear to be a transfer of of plastic.  I cannot alter the pattern with a steel blade tip or with acetone.  It is permanently pressed into and is now part of the entire coin pattern. The strike-through idea seems most likely, IMO.

 

edit: Dino-lite USB microscope

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