Lustrous 88D

I was thinking the same, the elevation, the temp required for boiling, melting ect. , but then I thought... (is 5000 ft or so difference in elevation really going to be significant difference on coin presses that are set for 35-80 metric tons strike pressure?) I'm not so sure. I mean a mile elevation is significant, I think Philly is somewhere around 50 ft on average.
I'm in South Florida which is around 9 ft elevation and it's a significant struggle going to Denver from here, discomforting, "struggle" might be too strong a word, it's significant, but does it matter with all that strike pressure? seems like the elevation issue would be negated but I'm not a physicist or whatever. LOL

Fun fact I found out today I didn't know about those 5 ounce silver America the Beautiful coasters the mint makes, they are struck on its own press that uses 540 metric tons of force.

 

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A change in pressure, is going to expand any air pockets or gaseous pockets. We still see cents with gas bubbles every once in a while, but not that often. A mile in elevation is quite a bit, I have made many trips from near see level back to mile, it takes it's toll on you. it also makes people sick if they stay here for any lengthy period of time.

 

So what you are saying is that Philly kept the best batches of planchets and sent the rest to Denver? I don't doubt that.