On Fri, Oct 31, 2014 at 11:51 PM, grarpamp <grarpamp@gmail.com> wrote:

On Fri, Oct 31, 2014 at 2:57 PM, Dave Horsfall <dave@horsfall.org> wrote:
> On Fri, 31 Oct 2014, Harald Hanche-Olsen wrote:
>
>> Are you perhaps thinking of the so-called EURion constellation?

... 

http://www.secretservice.gov/know_your_money.shtml

Quality counterfeiters of US notes don't care what

One of the driving forces to the changes in currency around

the globe was angst and some evidence of nation level 

counterfeiting.   Some small number of folk still have first

hand knowledge of currency attacks in WW2 and how effective

(or not) these attacks were.  Good accounts are sparse and

like other secrets seem to still be closely held.

I know that the local farmers market and flea market vendors in

this area are very cautious about $20 bills that are apparently 

color printer and color copier produced.  

I did see some mumble about N. Korea and very high
end intaglio printing about the same time the US and other

nations started changing methods and designs.  A secretive

well funded organization or government can do a lot to

produce counterfeit money.   A decade or two earlier a lot of 

effort was spent on durability. 

It goes without saying that the secret service can use OCR 

readers in multiple locations and track each and every printed

bill.   If their audits detect an interesting level I can see the next 

revision of design getting released into the cycle and aggressive 

audited shredder action for the previous.