Reviving an old thread since I had a recommendation from a fellow SCF member that I should post the certificate I received for this.

As everyone is aware, there is also a second copy known. So, something to keep an eye out for in traversing the stamp shows around the country. It would be interesting to see if any more surface.
Also, as a note the certificate is in error on the date as it is obvious the date is Mar 21, 1919 not Mar 2. The second copy also has a Mar 21 date. Perhaps this is the only day they were used or perhaps the whole sheet was cancelled using the same date?