Some collected info on concentric lines on coins

[signofthedimes]

I find these written responses spanning different coin chats to offer sound stability.

For concentric lines to be where you think they should be, apparently time controlled the allowance of truth, because until the US Mint started wanting to put all 4 date numbers on the die, reportedly some time in 1980’s. Outside of all 4 numbers being reduced, any concentric die face lines on across the devices pressed into a working hub, would be impossible…. I THINK!

The following concentric line pictures are from a collection of 14 subjects recovered of 1982 copper small date cents from one roll, (thanks eBay)

IMG_5267.jpeg IMG_5268.jpeg IMG_5259.jpeg
IMG_5265.jpeg
IMG_5262.jpeg
IMG_5261.jpeg
IMG_5264.jpeg
IMG_5266.jpeg

[signofthedimes]

More info on single squeeze hubbing, also known as all 4 date digits reduced from a Galvano for one initial hubbing.

single squeeze die wear is known to graduate towards the rim, where on multiple squeeze hubs, just the opposite, it moves towards the center.

if indeed the concentric lines 1982 copper small dates above are the earliest low relief single squeeze ready for strike up, we’d see wear moving towards the rim like this seen in the same small date copper 1982 cents with concentric lines.

IMG_5285.jpeg IMG_5280.jpeg IMG_5284.jpeg IMG_5281.jpeg IMG_5283.jpeg

[Rok3269]

I don't know that I understand all that you've posted here, but I find it incredibly interesting reading!!
Thank you for that!!

[signofthedimes]

I just thought of something. A conical shape to a working die face would succumb to the “crumple” zone when the space, lines may have had perfect machining between, after the force of the crumple zone was induced. By imparting the image impact we would see a field of crumple waves. Any clear line separation you can STILL see clearly was from the reduction lathe.