The website is medmaw.com and the part number is 0608 002118 (they call it Comtoise Cord). It is red, 2mm and comes in 21ft. lengths for £5.85 (appox. $8.50). It's not heavy stuff so the postage wouldn't be too bad, if you can't find any in USA.
Hi, I think I found what you are looking for. go to: http://klokonderdelen.marktplaza.nl It is german, but use translator. Go to the comtoise section and then to rope,string,hooks, coins. they have the red rope you want. Coins are supplied because French coins were drilled and used as the spacer on top of the weight to keep from winding it up too far. Of my clocks I only have one that has the original coins. Charles
I don't mean to be picky, but the site is in Dutch, not German. And unfortunately, if you read down the shipping information, you will see that there is a Euro 25.- surcharge for goods sent outside Europe.