Although based on a design by Whistler this does not look so much like his work as do the other r.: Designs for monogram for ISSPG ; v.: Tracing of monogram for ISSPG [M.1537]. It may have been drawn by Joseph Pennell (1860-1926), based on Whistler's design.
There are two pin holes at top and bottom, and one at centre left.
Last updated: 7th March 2021 by Margaret