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This stamp indicated that the fee had been paid to give 4th class parcel mail the same speed and handling as a 1st class letter. Fourth class mail is categorized as such because of its weight. However, some parcels needed speedier and more careful handling than regular parcel post. This was important when live animals like poultry or bees were sent by mail. If sent regular parcel post the contents would die! This ensured faster delivery and appropriate handling.