These are very neat. Partial collars.

It's when the excessive pressure squeezes out metal between the collar and the edge of the die making a extremely high thin rim. A partial collar happends when an out-of-position collar leaves an extra line around the edge of the coin which that you can see when looking at its edge.
First 1979 it's a double error. Partial collar with rail road rim. On obv and rvs. Uncirculated. second a triple error. A 1979 has a partial collar with R.R Rim, and it has a indent. And it still has full steps.But what has caused this indent?

 

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That little coin has been busy !

 

Their nick-name is 'RailRoad Rim'
due to it's similarity in look to a
train wheel.

Many times, they are the result of
not just the planchet not sitting
properly into the collar, but also
of them being T.1 Blanks to begin with -
T.1 Blanks are marginally smaller than
T.2 Planchets, before they go thru the
upsetting mill.

 

Great description. She's learning the Minting Process and applying her knowledge !!

 

Oh awesome thank you.

 

Picture and description helps us learn.Thanks

 

Yes I'm getting there.

 

I see now. Yes these are blanks and the indent is when two blanks fed accidentally into the same collar one of the blanks over lays the other cause it to have that indent. I see now.

 

I see now. Yes these are blanks and the indent is when two blanks fed accidentally into the same collar one of the blanks over lays the other cause it to have that indent. I see now.

 

You mean marginally larger, right. Hence the slightly larger type 1 blank doesn't drop down into the collar.

 

Your bouderline brilliant

 

Thank you

 

You’ve got the eye, for sure!

 

Nice finds!

 

If a type 1 blank is squeezed to form a raised rim, isn't the diameter smaller for type 2 planchets than type 1s? (Or do you mean once the type 2 is struck?)