This is a 'French Tint' postcard that is unused from 1921.
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As well as people playing pranks on one another on April Fools' Day, elaborate practical jokes have appeared on radio and TV stations, newspapers, web sites, and have been performed by large corporations. In one famous prank from 1957, the BBC broadcasted a fake film of Swiss farmers picking freshly-grown spaghetti, in what they called the Swiss Spaghetti Harvest. The BBC were later flooded with requests to purchase a spaghetti plant, forcing them to declare the film a prank on the news the next day.