Is this an error? March of Dimes set

An example would be the field mark below the buffalo on authentic 1937d 3 legged coins.

 

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They look like die groves to me

Or the " Die Grooves " that he took images of ...

 

Since the "markers" on these dimes are not useful in authenticating a rare coin, I'd just call them an error. If however, these low mintage dimes were later counterfeited, these "markers" would be useful in identifying some of the authentic dimes. I'd bet, if these dimes appreciate significantly, they'll be counterfeited.

 

Except it is only on 5 of the 12 I have. So would not be a good way to show genuine. I would call it an error too... I just don't know what kind, or if it makes it more valuable.

 

Only on 5 of yours, but since it's die issues, the error is on a bunch of them. Yeah, not sure about how the errors affect the value.

 

Much better photo's.

It appears as if the dippling is actually in the grooves. I think you already said that but this shows more clearly what "with the Proof missing" meant.

 

I have always been under the impression that the dippling (or frosting if you prefer) was added to the die by CNC Machinery following a specific "pattern".

That "pattern" or "stencil type pattern" would not include lasering damaged portions of the die.

I think the OP might be on to something which will require some expert eye's to examine.

Mike Diamond comes to mind.

 

I'm glad my set doesn't look like that. Looks like a return item. I bet it took the mint the same amount of time to make these dimes as it took for the sets to sell out. Seriously the pressman could have checked the die several times and the mint still would have come in under budget.

 

Many of these MOD sets have poor quality control issues and small minting errors similar to the coins posted from what I've seen of them.

 

I do not mind errors like these. Makes the coins unique. I do not like scratches, etc.