At first I thought this was a trade card printers proof. That last time I researched this one, I came up empty. Not so now. This is an unused label for a druggist & chemists proprietary concoction of the sort typical of the early 19th century apothecary.
Letterpress printed on thin green label paper for:
"Farriers' Liniment, Regarded by competent judges as the best Horse Liniment in use. It will be found a speedy and efficacious remedy for Sprains, Bruises, Weak and Swelled Joints, Contraction or Inflammation of the Sinews, Wind Galls, &c. &c. &c. Price 37 1/2 Cents Per Bottle. Prepared and Sold by Thos. Hollis, Jr. Boston, Mass"