These are Grade B enamel pins—in other words there are one to a few defects. The defect can be one of the following or a combination:
Please see the photo for examples of the defects.
Grade B pins will be shipped without backing cards.
Seconds or B-grade pins may not be as nice as an A-grade, but it is still wearable and can make a good addition to a collection if the defects mentioned are not bothersome to you.