c. 1920s. 5-3/8x6.75" thin art board has nice India ink and tempera original art on front with baseball in center surrounded by nine stars with images of baseball players along with two players in uniform at bottom and product examples at left and right. Most text is lightly inked in as designed for presentation. Upper right corner tip of right side edge has lt. bump with a few color rubs along extreme bottom edge. Bright and Fine overall. Comes with 8.5x11" letter with same text at top and bottom giving permission to use testimonial and photograph in advertising campaign for "Minit-Rub". Letter is signed in black fountain pen ink by two players. Top has signature "Wm. W. Hinshman" and bottom is signed "Steve G O'Rourke". Sheet has two folds as mailed with a few lt. handling creases, otherwise Exc. Unique pair.