An example from a series of prints done while teaching at the California School of Fine Arts. A detailed discussion of McChesney's printmaking can be found on page 96 of "The Stamp of Impulse" by David Acton, Worcester Museum, 2001.
The East and West Galleries in San Francisco exhibited "Duet" and the "S" series: S2, S3, S4 and S5 in August of 1951, there were 4 impressions of "S4" noted. The East and West Galleries was owned and directed by Ethel "Mrs Leonid" Gechtoff, the mother of AbEx painter Sonia Gechtoff.