Canada CL18P

1926 (June) (50c) Patricia Airways, Style Two, Series "1" proof pane, dark violet frame and RED airplane, printed on white ungummed paper; no marginal (WOMAN LAKE / AIR MAIL) or route inscriptions. Shows the Revised Value in top left margin - "$4.00" in red over original "$2.00" and two "$4.00" printed values in right margin. Top perforated horizontally, lower three rows are imperforate. A striking part perforated pane, Very Fine (Unitrade CL18P variety)

An unlisted part perforated proof similar to CL18P (cat. $550 each) but the airplane is printed in RED instead of orange as adopted for Style One.