Dick Johnson submitted this entry from his Encyclopedia of Coin and Medal Terminology. Thanks. -Editor
The inner aperture of this coining collar shows a blank area between areas where reeding has been machined into the collar wall. This creates
the edge of a struck piece using this collar in a coining press. It will have a plane edge where the blank area without reeding is located and two areas with. Note lettering on the collar indicates
this is for a 50mm (2-inch ) coin, dual blank areas – called “bars” here -- and the date it was made. Any number of blank with reeded areas is called interrupted reeding. Photo Medallic Art
Interrupted Reeding. Struck from a collar with one or more smooth areas on the inner wall of the collar alternating with the reeding. This is in contrast to a
piece which is fully reeded forming a REEDED EDGE, or completely smooth forming a PLANE EDGE. When only one smooth area is formed, this is generally at the bottom or top edge so edge marking can be
placed there at some later time. See REEDING, EDGE LETTERING AND NUMBERING.
In 1965 the Franklin Mint developed a method of interrupted reeding that provided gambling tokens of similar diameter with edge distinctions to identify different casino's tokens by the edges
when stacked in columns or laid out in rows. Pairs of blank and reeded areas, plus different width of reeds give this distinction. A separate collar with unique blank and reeded areas provided this
when pieces were struck in this collar. It was granted patent number 3350802 in 1967 for this type of reeding. See REEDED EDGE.
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