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What causes railroad rims?

prooflikeprooflike Posts: 3,879 ✭✭
in U.S. Coin Forum
I have a 1971-D Kennedy half that has railroad rims from 6-11 o'clock on the obverse and 9-1 o'clock on the reverse. What causes this? It seems to be about the proper diameter and thickness??

What causes this??
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    BillJonesBillJones Posts: 33,487 ✭✭✭✭✭
    The coin is struck slightly out of the collar, which causes a metal flow that results in a narrow strip of metal around the outside of the coin.
    Retired dealer and avid collector of U.S. type coins, 19th century presidential campaign medalets and selected medals. In recent years I have been working on a set of British coins - at least one coin from each king or queen who issued pieces that are collectible. I am also collecting at least one coin for each Roman emperor from Julius Caesar to ... ?
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    prooflikeprooflike Posts: 3,879 ✭✭
    Thanks! Always a prompt answer in this forum image
    image
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    Dog97Dog97 Posts: 7,875 ✭✭✭
    A piece of trash was jammed in the collar preventing the springs from fully raising it.
    Change that we can believe in is that change which is 90% silver.

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