Director Henry Linderman’s pattern and specimen coin rule.

One of Director Henry Linderman’s pattern and specimen coin rules as excerpted from a letter concerning public sale of Trade dollar patterns for $3.00 each.
“June 3, 1873
…The rule to be observed is that, with the exception of the necessary impressions sent to this office, and such as may be proper for preservation in the cabinet, no pieces will be struck except in the metal in which the coin is issued and which shall be as readily obtained by the public as by officers and employees of the government.”
1
Comments
It would appear that in later years, this rule was not adhered to.... I refer to aluminum cents specifically. Cheers, RickO
The rules changed many times, so context is important.