Although Stewart (or Stuart) D. Howe acquired Duponco's Golden Periodical Pills in 1866 and had a design approved for issue that year, it was not until February of 1870 that the first of his private die stamps were issued. These were printed until Howe sold the product to Kidder, Wetherill & Company in 1873. The final delivery of stamps with Howe's name was March 25 of that year. 53,727 were issued on old paper and 30, 415 on silk paper. The copy shown is on old paper.

The stamp for Arabian Milk Cure (For Consumption and Diseases of the Throat, Chest and Lungs) was first issued in October of 1871 and continued until September 4, 1882. 238,962 were issued on silk paper and 11,660 watermarked paper. The copy above is printed on silk paper.

The red and green Howe stamps are no longer listed in Scott. The story runs that the son of the manager of Kidder, Wetherill was a stamp collector, and recognized an opportunity to create some instant rarities. The fellow later claimed that he had one sheet of each color printed before the plate was changed to reflect the new ownership. There is some discrepancy in dates, such that there is a suspicion that the stamps were reprints made in 1876 rather than meant as color trials in 1873, suggested by a wily young collector. Whatever the reason they were printed, they were never placed in use. 105 of each were delivered, all printed on silk paper.

It is not clear who J. McCullough actually was, though he could have been Kidder, Wetherill's principal marketing agent for the product. The Duponco's stamp issued with his name first appeared in July of 1873 and was last issued May 19, 1883. 41,800 were issued on silk paper and 16,463 on watermarked paper. This copy is on watermarked paper.

A circular giving directions for use of Duponco's and notice of change of ownership.

A box for Duponco's Pills sold under McCullough proprietorship.