open collar Its name notwithstanding, a closed collar that surrounded the anvil (or lower) die used in striking early U.S. coins on planchets whose edges already had been lettered or reeded.
Open collar - A device used to position a planchet over the lower die. It was employed specifically for striking early US coins whose edges had already been stamped with reeding or lettering.
An open collar is slightly wider than the surrounding coin and serves to position the planchet between the dies for striking without causing damage to an edge device applied before striking.
An immediate result was greater uniformity of the coin impressions; the "open collar" process previously used allowed the planchet to spread out somewhat which resulted in minor variations in the coin size.
Although known as "Large Size," these dimes should more properly be called the "Open Collar" type. They were struck without a restraining collar, giving them a broad, low-rimmed look. Averaging 1.
 See also: Coin, Silver, Struck, Collar, Mint
  
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