2003 10c Repeating Bird Tail

I've read somewhere it might be a determination of the die but I think maybe they usually accompany lots of lumos? What's Machine Doubling exactly? Same as double stamped? .

Again, I'm thinking perhaps Die Deterioration Doubling, due to the irregular shapes.

Holy canola oil trying to understand what I just read.

So Machine damaged is the same thing as Machine Doubling? And 'strong Machine Doubling' means it's more evident.

Which happens during the striking of the coin due to movement basically.

I'm assuming 'devices' means the parts of the image?

Machine damage aka Machine Doubling will make the 'devices' smaller in size and the reduced part will be flattened.
What confuses me in one sentence it says, note how the devices are close to the same size, and then note how it reduces the devices, machine damage always reduces the devices but note how how they are the same size. Huh?

It changes wording from Machine Doubling to Machine Doubled? Is that the same thing, just a third way to say it?

When it says machine damage happened after the strike, what machine is it referring to? The die or something? But then it refers to a die double?

So we have

machine damage
Machine damage doubling
Mechanical Doubling
Strike Doubling
Machine Doubling (makes devices smaller)
Shelf doubling
Sheer doubling
Field doubling
Shift doubling
Ejection doubling
Machine Doubling on incursed
Machine doubled
Machine doubled incursed

All means the same? - but it says flat field doubling is with Machine Doubling? Note how flat field doubling in one area creates Machine Doubling in other areas. Like what? So flat field doubling isn't Machine Doubling?

We also have to include

Machine push doubling

But these below are different but still meaning the same to each other? I gleened hub doubled and Machine Doubling is the same thing thing just different ways to express if it's larger or smaller? And push to to say it bounced etc etc the changes in words it to say how did moved.


Hub doubled (makes devices larger)
Hub doubled die
Hub doubling

And die doubling or rather a double die, is another thing altogether.


*Note how hub doubling is often accompanied with MD

Machine damage push
Machine damage on altering


Machine Doubling happens when the die strikes the coin and there is instability, however the Machine Doubling happens after its been striked?

Note how MD is flatted also note how MD is contoured and not flattened.

Note proof coins are struck twice and normal coins aren't, then note on normal coin how the doubling happens after the 'initial strike' is it one or two.

Note how doubling happens after the strike, almost at the same time but a bit later, ok.

Machine Doubling on altering the devices?

Bear with me here, I think I'm getting it slowly, I have little chance identify the differences yet however I think I'm getting my head around it.

What I've gleened this far.. BTW that was painful lol

The die might for whatever reason have two images on it and I don't know why it would but that's cool and the images repeat the effect consistently and that's sought after.

Machine Doubling is the machine holding the die and it let the die move for whatever reason and it creates a Double effect as well, however this can happen and it's not an error as such more like. Can't win em all scenario and therefore anyone who is savvy doesn't really want that as much, because its a random thing and easily done.

So using what I learnt am I correct to call this ....

Machine Doubling more specifically hub doubling.

I think some of my questions I answered myself as I wrote this tome.but if there is anything I've got completely backwards let me know

Way too many questions in one post so without reading through the whole article, I will try to answer the last question.
Working hub doubling is doubling on the hub which produces the working dies. This results in what is known as a Doubled Die which increases the size of the devices and will appear on every coin struck from those dies. This is the collectible type of doubling.
Machine Doubling, one of several worthless types of doubling, occurs during the striking of the planchet in the coining press. This is usually caused by a loose collar and reduces the size of the devices.

This coin I really like, good year. Good condition, and has that triple look about it.