Two FDCs with color American flag cachets, both postmarked on February 28, 1973, and bearing 8-cent George Gershwin stamps, individually signed and inscribed in black ink, “Ira Gershwin, For my good friend, Bill Dirksing, I. G.” and “Ira Gershwin, For Slats, Affectionately, I. G.,” and the lower left corners of both envelopes bear affixed ink signatures of George Gershwin on 3.25 x .75 slips clipped from checks. In overall fine condition, with overall toning to one cover.