1992 quarter no mint mark

Is this the result of a grease filled die? There does not seem to be any weak strikes anywhere on the coin. There is absolutely no sign of a mint mark. My guess is grease filled die.

 

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I would think so too.

Which reminds me....

 

In 1992, quarters made in Philadelphia didn't have a mint mark.

 

Yeah they did...

http://www.usacoinbook.com/us-coins/1992-p-washington-quarter.jpg

 

I just did an image search and 1992 quarters had a p mint mark.

 

Thanks Books and penn...I stand corrected, I was looking on the reverse...senior moment. It changed in 1968...I was only 23 years old then.

 

I thought you had caught me with a little foot in mouth, and had to cheat to figure it out, so don't feel too bad.

 

I don't even see an indent where it should be. Maybe look under a microscope to see if there is anything there. If not you may have something very special.

 

I did and there is just nothing there. That's why I posted it. I'm not sure what to think about it.

 

Have you googled?

 

Maybe you might want to get in touch with Ken Potter then. It might be worth your while.

 

I googled it and all I could find was people saying grease filled die. This one just strikes me differently. All the other ones posted do have signs of a strike. This one just seems just as smooth as the field would normally be. Minus the normal wear.

 

When I really zoom it in I feel as if I can see the very faint top part of the P, but it could be my imagination.

 

I may be wrong on this but isn't the MM part of the working design now ie part of the die and if so could this be the result of an over polished die? I can't remember if it is or not, too many things to remember about coins lol

 

I don't have that kind of technology but I do have a small microscope. I just can't see anything there. Maybe I will take it to the local coin dealer and see what he says.

 

I read somewhere that it is part of the working die. That is why I'm questioning whether or not it could be grease filled or something else.

 

If memory serves me. The mint marks were punched into the working dies until 1999, when at some point within that year they were put on the galvano. 1999 was the year that single squeeze technology was put into place.

 

The mintmarks on the proof coins became part of the Master hub in 1985, and on all the business strike coins from P and D (except the P cent) in 1990. So yes the mintmark in 1992 was part of the master hub and so would be present on all working hubs and working dies.

Since the mintmark in the die is incuse it would take a LOT of surface grinding to eliminate the mintmark from the die. That much surface grinding would also eliminate a lot of other shallow detail features on the coin and they are not missing.

So mintmark was in the die, it wasn't removed by polishing/grinding, so grease filled die.

1997 with possibly some being done that way in 1996.

 

I believe I found the P. I replaced my batteries in my microscope. Can anyone else see it?

 

Makes sense, I thought I read somewhere it was put in the working die but with my memory who knows lol.