Vatican 35 - 40 VF set on registered cover to Warsaw Poland, #37 + 40 are 2nd printing, rest are 1st. CDS June 3, 1938 w/ registered "Citta del Vaticano 104" Label + "Expres" RS on front and properly back-stamped. Open at bottom. Set in Beautifully arranged order at top left. Signed Raybaudi under stamps.