The special license plate commemorating Plymouth’s 400th anniversary hasn’t been received as well as hoped. For the plate to go into production, Plymouth’s 400th anniversary organizers must receive at least 1,500 prepaid orders by the end of September. But as of last week, they had received fewer than 700. “We’re trying to get up to that 1,500,” said Alexandra Rollins, managing director of Plymouth 400 Inc., the nonprofit that’s planning the townwide celebration for 2020. The limited-edition license plate design features a light-blue image of the Mayflower ship with a silhouette of a Native American man, and bears the words “1620 Plymouth 2020.” They cost $40 apiece, and a portion of each plate fee will help fund the town’s 400th anniversary festivities. To order a plate, visit www.plymouthma400.org/get-licensed.