I found one of the spools of line from RSM. It says "Manhattan/CDT" and "Cole Flex", 203 Progress Drive, Manchester, CT. Just FYI. I suppose there is a chance that this spool was simply reloaded from a bigger spool someplace, by somebody. I can't imagine Eric doing that, but it would be reasonable for a cable manufacturer to load up product in "only" 1,000' lengths on whatever they could scrounge up.
Steve