Pete Apple would love this.

RobertLahti

Improper alloy mix.
A Rockwell pin on the raised edge, where Pete Apple has reported is the only place they are administered. The depression was covered. 3 die cracks.

The discussion in question between Pete, and Fred, Apple and Weinberg is online under the name "can you tell a real rockwell test" on Coin Talk.

Namvet69

It's nice to learn something this morning. Great pics. Thanks. Peace Roy

Oldhoopster

Roller marks/stains, not an improperly mixed alloy. They are common on cents from the late 70s and early 80s

The "Rockwell test marks" are PMD

Rockwell tests are done on incoming planchet lots (depending on the QA sampling criteria required for the vendor). These are destructive tests and the samples are disposed of afterwards. Taking samples from the lab and mixing them with production parts would be against the Quality Procedures and could result in an employee getting disciplined. Even in the very unlikely event that one of these samples did make it to production, the strike would have obliterated the test mark.

The die cracks are real, however

RobertLahti

I was only interested in a Rockwell test left in the die. I only assumed that the cud break beneath the applied pressure where rockwell tests take place, where the cracks are, supported observing.
Of course, many strikes to increase the size of the progression of the cud will not have occurred on a Rockwell die, but perhaps one to observe the outcome, like a test is aimed at observing.