American Express Printed Cancels: Varieties of Subtype D

American Express 1900 printed cancels (1900 and 1901 sans serif only) subtype D, where each of the three stamps below has the 1 of the 1900 under the E in the AM. EX. CO. portion of the cancel. The first stamp below is the "normal" variety of subtype D, with 3 rectangular equal size periods.

Subtype D, large periods after AM and CO. Overinked cancel.

Subtype D, large period after CO. Overall cancel is overinked.