The listing, Stanton US classic bank note NSM has ended.
I think this a #160 printed by the Continental Bank Note company in 1873 with secret mark. However it may be the #149 printed by the National Bank Note Company in 1870 with no secret mark. The stamp has a segmented fancy blue cancel. I am pulling it straight from my computer file and will examine it closer later to clarify this. In either case Mystic sells the stamp for 100 or 95 dollars. I am starting the bidding at 3000 credits with a GIN at 7777.