Stickers are about the size of the ones typically found on banana bunches. We don't know what the purpose of these was, because the company stationery that was also in the envelope is not a letter, it's blank. The date is worn off the post mark, but the United Food Company was purchased and changed their name to United Brands in late 1970 Chiquita became the name of the company in 1984, until then it was just one of their brands, meaning this was most likely 1970 or older.