I am not positive anyone knows for sure. Jay Hopkins might have the best answer for you, so you might contact him. His second book, highly awaited, will cover the NC area as well as other Southern states.
It has been my understanding that the banded horns are an early 1800s phenomenon. I think the difficulty is how few were scrimshawed with dates.
You may be disappointed trying to track down info on Salem banded horns. There may have been some made there, but in my time at Old Salem, I have never heard anyone mention a horn maker. I didn't say there wasn't one, I just haven't heard of it. There is lots of documentation of longrifle makers there. The Moravians wrote down everything, and controlled trades and production, so you can do research and determine if there was or wasn't a horner in town.
The banded horns came from all over it appears. The ones I think you are talking about are the ones with multiple bands. I tend to think of those as being from piedmont NC, southern VA, SC and GA. Jay's book will hopefully shed light on just where.
Check Michael Briggs book on NC horns and Bill Ivey's NC longrifle book. Both have nice horns shown in color.
Banded horns are cool and a great field of study.
Best wishes, and God Bless, Marc