Bidspirit auction | Portugal 1920/22 Ceres, circulated registered

Portugal 1920/22 Ceres, circulated registered envelope from Lisbon 20.6.23 with postage 1$50, noting 2 stamps of 60 cents with different perforations, for Paris, France, RAYON-CENTRAL 23.6.23. On the back, an unknown handwritten note, it was returned to the origin marked RETOUR / AL´ENVOYEUR / R C. Returned registered letters are very uncommon.