These are acid dipped. Note the loss of rim and thickness. It could be possible fir that theory of size, a vending machine/parking meter prior to the 80's went by size only. Why in the mid 60's the cutouts for electrical boxes were increased in sizes. No longer could I use my nickel and quarter slugs in the candy machines (worked a while longer in the cigaret machines...

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Edited by Crazyb0
11/22/2017 7:37 pm