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<p>[QUOTE=&quot;Conder101, post: 1985243, member: 66&quot;]The proofs have the lettering applied during the striking through the use of a three piece collar.&nbsp; This can be done because the proof striking is comparatively slow, 20 to 30 coins per minute.&nbsp; But it isn&#039;t practical with the high speed business strike presses at 750 coins per minute.&nbsp; So they are lettered after striking with the Schuler edge lettering machine at around 1000 coins per minute.&nbsp; If an unstruck planchet gets mixed in with the struck coins it can get run through the edge letterer as well.</p><p><br /></p><p>As furryfrog says that is why there are right side up and upside down edge letterings on the coins.&nbsp; They all come out of the press the same side up but after being dumped several times from press to tote bin to hopper they get all mixed up and go into the edging machine face up or face down at random.[/QUOTE]</p><p><br /></p>

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