Zinc based and in a good, worn condition.
Not marked but a known variation that is commonly referred to as the „Pillow Crimp“ due to the charactistic crimp of the hinge.

Zinc based, and apart from the broken hook(!), in a good, worn condition.
Not marked but a known variation that is commonly referred to as the „pillow crimp“ due to the shape of the crimp holding the hinge.

Zink based and in a very good, slightly worn condition with practically all of the silver plate still present and some patina.
Not marked but a known variation that is commonly referred to as the „Pillow Crimp“ due to the shape of the crimps holding the hinge and hook.

Zinc based and, apart from missing the hinge and hook, in a good, somewhat worn condition with most of the silver plate still present.
Not marked but a known variation that is commonly referred to as the „Pillow Crimp“ due to the shape of the crimp usually holding the hinge. See GCA database.