1996-W Roosevelt Error!

CoinMaster1229

Reverse Staff, Detail Missing about half way down. Is this uncommon?

E-bay # 8415302005 Auction Can be seen NOW!!!

eyoung429

huh? bad auction number

Coxe

No longer listed. I have a couple of those and will check them out to see if they are missing that detail.

CoinMaster1229

You can see action now!!! Just Started E-Bay # 8415302005

ledzep87

If it is missing detail, could it be a worn die or a weak strike?

CoinMaster1229

Half way down the staff or torch, the detail abruptly ends. it looks rounded the rest of the way down the torch!

Coxe

Is this your coin?

Could grease, water or something gotten into the die? I forget, is the reverse die face up in today's minting process? If so, water is fairly incompressible and I would think a drop in the torch, which is low in the die could roll to the bottom of the torch (based on trivial alignment tolerance uncertainties) upon the advancement of the metal and restrict it with even surface tension. However, I'd have to figure the size of the drop, the the physical parameters for water or other candidate and know the striking pressure. The planchet alloy probably complicates it too.

relayer

Dunno

Barndog

CoinMaster1229

Yes it is my coin, it is hard to beleave water could do that.

OffMetal

I hate it when no one posts a link



Interesting...

Coxe

<< <i>Yes it is my coin, it is hard to beleave water could do that. >>



Water can do a lot of things. However, at striking pressures I think it would instantaneously vaporize, losing the characteristics I hypothesized. We all know grease does this sort of thing anyway.

Cam40

cladking

<< <i>I hate it when no one posts a link



Interesting... >>



Thanks for the link. This isn't overly unusual even for mint set coins and is usually attributed to grease.

This coin was almost certainly struck on an old vertical press but most circulation issues now are struck
on horizontal presses.

Conder101

<< <i>However, at striking pressures I think it would instantaneously vaporize, losing the characteristics I hypothesized. >>


Got it backwards. As pressure rises gases are is more likely to be a liquid, and liquids become solids (If temperature is held constant If the temperature is no held constant it still occurs but the pressure at which it happens is higher. Eventually the phase shange will occur no matter what the temperature is.). Now the sudden DROP in pressure as the die comes away from the coin could possibly result in the vaporization of a drop of water. Or the temperature that the die reaches after doing many strikes could evaporate a drop of water that falls on it. Bu those would occur with the dies apart and therefore are of no real concern. A drop of oil and god of "grease" on the other had would not go through a phase change and would simply act as an incompressible "lump" in the void of the die that prevents the metal from filling in the details.

Coxe

Correct. (And I am a retired physicist, but a theorist.) Thank you.

eyoung429

Grease strikes are a wonderful thing to error mavens:

theRealist

Is it considered good form to hype your own coins up for auction on this board?

Barndog

<< <i>Is it considered good form to hype your own coins up for auction on this board? >>



Very good point. It is considered poor form to hype, advertise, offer, or otherwise entice to buy on this board. The Buy, Sell, Trade Forum would be the right board for CoinMaster1229 to make the sales pitch. You are fairly new to this forum (welcome) and you understood the rules, so we'd hope the other fairly new person would do the same!