The Three C4s

The "C4" acronym is popular in U.S. numismatics, with at least three associated entities. Most well known is the Colonial Coin Collectors Club, which publishes The C4 Newsletter, now in its 33rd year. The Carson City Collectors Club of America ("C4OA") held forth from 2005 to 2015, and, courtesy of David Schenkman, we recently scanned a run of the short-lived Coinquest Countermark Collectors' Circular, published by Carling Gresham from 1975-1976. The periodical aimed to unite countermark collectors and to promote associated research. Authors included Warren Lapp ("Counterstamps on U.S. Large Cents" in issue no. 2), David Schenkman ("More Countermark Pairs" in issue no. 5) and the authoritative Gregory Brunk, who contributed "A Tentative Countermark Bibliography" in no. 6.

The thought of only three C4s is oddly disruptive to our sense of bibliophilic and nomenclatural order. Surely an E-Sylum reader can identify a fourth?

Image: Coinquest Countermark Collectors' Circular masthead

Garrett Ziss adds:

Link to Coinquest Countermark Collectors' Circular on Newman Portal:
https://nnp.wustl.edu/library/publisherdetail/541314