I encountered these in an antique store last week. The owner bought them from a picker about 8 years ago. She still hasn't found anyone who has seen anything like this before, and has no idea what they were used for. They are lead, very soft and flexible, and about an inch long. They will clip over a very narrow edge. The decorative bit stands up/out from the surface over which they are clipped. From left to right - Cairn (or Scots?) Terrier; Lion; Fleur de Lys; St. George's Cross; Thistle. There is also an arrow, and an anchor.
Have you seen these before? I am so intrigued and anxious to solve this mystery!!