We were lucky to find these cabochon pins as new old stock - never used - in a Brooklyn, New York warehouse. They are cleverly made and most are in fine shape. There is some wear from handling on some of the cabochons.
It appears that the cabs are made of metal and that the image has been transferred onto the cabochon either by printing or some other method. Each of the pins are the same and feature a delightful bulldog against a pale blue background.
If you care to do so, you might re-work these into assemblage pieces by removing the cabochon and applying a new image, or, indeed by replacing it with something else. Please be careful if you choose to remove the cabochon - especially if you are bending the prongs.
These were made by a novelty company - not a jewelry company - so please be careful when working with them. They were made in the 1950s or 1960s.
Each measures 7/8 inch in diameter has a self-pin on back that has been attached mechanically rather than by adhesive. So, for novelties, these are quite well made.
On the back (it's hard to read), it says:
U.K. REGISTEREDDESIGN NO. 989135
And, under the pin, HONG KONG.