1946s imm-001 inverted mint mark

[PetesPockets55]

It's been eerily quiet on the coin forum lately so I thought I would share this 1946s imm-001 inverted mint mark I found in an original roll earlier this month.
I actually found more than 1 but this is the best one. The weakness on the bottom loop is on all examples and is caused by the punch being tilted when striking the die face. The press making these must have been leaking some kind of lubricant because it is on most of the ones I found as well as the PCGS examples.
1946s imm-001 Variety Vista LINK
PCGS LINK (better images than VV)

Surprising that more inverted mintmarks weren't produced when you consider the S looks the same to the naked eye. Not until you look at the serifs on the Mint Marks do you realize they are different.

Here are the different MM styles at Variety Vista LINK at San Fran for anyone interested in them.

Hope you enjoy and thanks for looking.

 

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[RTR]

Excellent job on the clarity of the Pix.!

 

[PetesPockets55]

Thanks RTR. Just use my Droid on two thin boxes to get the height correct and keep it from shaking while snapping an image. I use two boxes so I can remove one for closeups with the macro lens.

Articulated desk lamp for light and a clamp-on macro lens for closeups. The whole camera setup, excluding the light, is on a gray/black mouse pad (for true colors) that it can be rotated to get the best angle for catching the details.
The worst part of this system is having to take so many images because the screen on the phone is so small and it is hard to see if I have things like die markers showing up.

 

[RTR]

Best quality close up pix. I've ever seen here

 

[PetesPockets55]

Thanks again and I'll try to remember to post an image of the setup for others to see how simple (primitive) it really is.

EDIT: The phone in these pics was just a stand-in since I was using my regular one to take these images.

 

[Dozer D]

Is this so-called inverted "S" just in year 1946 or has this been seen on other years. Now it would really be a mint error to find an inverted "D" mm.
Further question, isn't the mm part of the original die stamping? If not, why would the mint go thru so much trouble to reinsert & realign the coins to get the mint mark in the right position. Can someone clarify as to how the mm is stamped if it's part of a second stamping.

 

[PetesPockets55]

There is another inverted S mint mark Lincoln cent on the 1910s RPM-003 LINK Here . I don't think there are any others but there are some over mint marks (D/S in '44, '51 & '52 and even an S/D in '46)

Wexler lists some Quarters in his Inverted MM page LINK HERE .

And I'm not familiar with Jefferson nickels but I beleive there are some inverted D's in this series.

The dies were all produced in Philly during this period before any MM were placed. Then they were shipped to the appropriate mint for them to add the MM by hand. (Denver and Philly both produce dies now.)
The mint marks were individually placed on the dies by hand up until 1989 according to VV listings LINK HERE .

Sometimes the mint worker setting the MM would strike the punch more than once if the MM wasn't visible enough. If the punch rotated, moved or was out of position (which happened fairly regularly) we get our beloved RPM's .