RS58b, US Proprietary Revenue Medicine stamp, R.C. & C.S. Clark
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$25.00
The ABC of the Clark brothers’ stamp stands for Anti-Bilious Compound. Rollin C. Clark and Curtis S. Clark appear in the Cleveland city directory in 1871 as “chemists.” Their stamps were first issued in August of 1873 and up to June 1, 1882. 275,000 were printed on silk paper and 32,297 on watermarked paper.