When did the US Mint stop "adjusting" planchets by hand?

GoldenEyeNumismatics

On a fair amount of early US coinage, planchet adjustment marks are present. Does anyone know the year the US Mint ceased the practice of adjusting planchets by hand?


For those who don't know, "adjusting" an overweight planchet is to file it down, by hand, to the proper weight. I suppose you could also include silver plugs under the realm of planchet adjustment, but plugs are not the focus of my question.

SilverEagles92

RWB commented in a similar topic across the street:

"Gold was 1933. Silver was, I think about 1912. Thereafter only the finished coins were checked. (I'll check my files on that....)"

RWB

After the introduction of steam presses and edge reeding, most adjustment was done on the edge of the gold planchet. Light or heavy struck silver was melted.

GoldenEyeNumismatics

<< <i>After the introduction of steam presses and edge reeding, most adjustment was done on the edge of the gold planchet. Light or heavy struck silver was melted. >>



Is it possible to find gold coins with remnants of the edge filing still present? Or were the file marks always entirely struck out?

Dokis

The silver plugs ended with the 1795 Dollar, I believe that a single silver plug 1794 is known.

RWB

I doubt anyone has ever looked at the reeded edges for file marks. I suspect they would be almost impossible to identify - which is why the edge was filed in the first place. Modern coin holders make the edge anonymous.