Sacagawea Experimental Rinse- How is it authenticated

Oldhoopster

I don't have one, just curious as to how the TPGs determine if a 2001 Sacky was subject to the experimental rinse mint process. Was it:

• Visual? Is there a color difference? Is there a physical appearance that can be traced to die finish?
• Chemical? Is there a residue that can be determined by something like GC or chemical reaction that can be picked up by XRF or SEM/EDS?
• Provenance? If I recall correctly, Mike Byers sold some/many of the early examples 20 years ago. Were these certified by Larry Briggs and SEGS?

I wasn't able to find anything in the archives, but that doesn't mean something isn't there. Thanks

JBK

It all seems a bit fishy to me so I'll be interested to hear the answers.

Kurisu

@FredWeinberg Gave me/us some tips here in a thread somewhere. I also spoke to him very briefly about that when I was going through some 2000 P Sacagawea rolls.

One comment I remember from Fred was that those coins have a very distinctive green tint.

Byers

Good memory.

Coin World published this discovery in an article 20 years ago.

Segs certified them first.

Then a year later, PCGS. Then others followed.

Here is the link from my archive:

https://mikebyers.com/exprinse.html

Namvet69

I have one in a Global slab. The color is definitely unique, Darker, matte or satin finish. IMO. Don't know about die markers. But I'd like to know. I'll dig it out. Roy

Kurisu

@Namvet69 said:
I have one in a Global slab. The color is definitely unique, Darker, matte or satin finish. IMO. Don't know about die markers. But I'd like to know. I'll dig it out. Roy

Does yours have any green hue to it?

Experimental rinse page
http://www.smalldollars.com/dollar/add002.html

ricko

I believe I have seen a couple of these in change from machines.... Was not interested in them, but they had the greenish discoloration and stood out from others. Also, they were 2001P coins.... Might have just been tarnished in some way, but I did think of those coins at the time. Not interested in saving them... Cheers, RickO

FredWeinberg

I don’t recall saying that they have a green tint, but they will have a very distinct dark bronze luster - the smooth edge should show it much lighter, as some of it was removed when the coin was ejected from the collar after striking. Once you’ve seen a few of them they’re easy to identify – there are many similar looking coins with similar colors, but they are totally flat without luster - those are environmentally damaged.

Kurisu

@FredWeinberg said:
I don’t recall saying that they have a green tint, but they will have a very distinct dark bronze luster - the smooth edge should show it much lighter, as some of it was removed when the coin was ejected from the collar after striking. Once you’ve seen a few of them they’re easy to identify – there are many similar looking coins with similar colors, but they are totally flat without luster - those are environmentally damaged.

Thank you for the re-cap. Not sure where I'm remembering a green hue comment from...thanks for clarifying!
...Memory is the 2nd thing to go

Zoins

Here's a thread with good discussion on these.

https://forums.collectors.com/discussion/1049497/experimental-rinse-dollars-what-was-the-verdict

I'll also link this thread here so they can be found.

Namvet69

Found it! Global holder says MS68. It is definitely a darker warm bronze color with a satin finish. Any way to tell when it was slabbed at Global? Peace Roy