"R" in a skirt. What is this called?

[Lizescobar]

This 1961 penny has the "R" in liberty completely filled in on bottom like a skirt. What is this defect/ damage called?

 

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[A2coins]

now that is a nice find

 

[DizzyDigger]

That filled in "R" could to be factory installed.

Almost looks as if the die didn't make a clean cut, and failed
to remove the material.

Your image size was huge, so I trimmed it down a bit and tried
to bring out the letters better:

 

[Lizescobar]

What does " factory installed" mean? Is it worth keeping or just another mechanical error?

 

[Lizescobar]

And if a letter is completely missing on a coin? Or of the the L in Liberty is an I instead? What are those called? Sorry bout all the questions. Justvtrying to learn about my finds and thank you for fixing my pic. U guys are great. I love this site.

 

[l.cutler]

That is a small die chip on the R, no real value but certainly worth keeping if it interests you. There could be different reasons for a letter to be missing or look different. A filled die probably most likely but post pictures and you will get a better answer.

 

[Professor of Engineering]

Interesting problem coin!

 

[galenrog]

Yep, die chip. An excited collector with deep pockets may pay between $0.50 and $1.00. At least that is what I get locally.

Time for more coffee.

 

[enamel7]

What does " factory installed" mean? Is it worth keeping or just another mechanical error?

Factory installed means nothing. And dies don't cut the design into the planchette.